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Mac Cabe
- Mac Cába
Mac Cadam - Mac Adaim
Caddell - Cadal
(Mac) Cadden - Mac Cadáin
(Mac) Caddo - Mac Connuibh
(O) Cadogan - Ó Ceadagáin
Cady - Mac Ádaidh
Mac Caet - Mac Dhaibhéid
(Mac) Caffelly - Mac Eachmhíle (Maigh Eo)
(Mac) Cafferky (Cafferty) - Mac Eafarcaigh
Mac Cafferty - Mac Eafartaigh
(Mac) Caffrey - Mac Gafraidh
Mac Cagheron - Mac Eachráin
Mac Cagherty - Mac Eachartaigh
Mac Caghey - Mac Eachaidh
(O) Cagney - Ó Caingne
Mac Cague - Mac Thaidhg
(O) Cahalane - Ó Cathaláin
Mac Cahan(e) - Mac Catháin
O’Cahan - Ó Catháin
(O) Cahany - Ó Cainnia
Mac Caharty - Mac Eachartaigh
Cahern - Mac Eachráin
O’Caherny - O Catharnaigh
Mac Cahery - Mac Gafraidh
Mac Cahill - Mac Cathail
(O) Cahill - Ó Cathail
Cahir - Mac Cathaoir
(O) Cahir - Ó Cathaoir
Mac Cahon - Mac Eacháin
Cahoon- Colchún
Mac Cahugh - Mac Eachú
Mac Cahy - Mac Eochaidh
Mac Caig - Mac Thaidhg
Mac Cain - Mac Eáin
Mac Cainsh - Mac Aonais
Caird - Ceardaí
Cairns - Ó Ciaráin
Mac Calden - Mac Ailín
Caldwell - Mac Conluain
Calfe (Veale) - de Bhial
Calhoun - Ó Cathluain
Mac Call - Mac Camhaoil
Mac Calla - Mac Amhalaí
(O) Callaghan - Ó Ceallacháin
Callagy - Ó Calgaigh
Callaly - Mac Ailile
Mac Callan - Mac Cailín
(O) Callan - Ó Cathláin
(Mac) Callery - Mac Giolla Laoire
(Mac) Callery - Mac Giolla Riabhaigh
Mac Callily - Mac Ailile
Callina - Mac an Laighnigh
(O) Callinan - Ó Callanáin
Mac Callion- Mac Ailín
Mac Calliskey - Mac Conuisce
Mac Callister - Mac Alastair
Mac Callnon - Mac Callanáin
Callow - Mac an Chalbhaigh
Mac Callum - Mac Colaim
Mac Cally - Mac Eachmhíle
Mac Calman - Mac Colmáin
Mac Calmont - Mac Calmáin
(Mac) Calpin - Mac Ailpín
(Mac) Calshender - Mac Alsandair
Calter - Ó Coltair
(Mac) Calvey - Mac Calbhaigh
Mac Calvin - Mac Conluain
(Mac) Cambridge - Mac Ambróis
Cameron - Camshrón
Cameron - Ó Cumaráin
Mac Camley - Mac Camlaoich
Mac Cammon(d) - Mac Amainn
Campbell - Mac Cathmhaoil
Campion - Caimpion
Canally - Mac an Fhailí
Canavan - Ó Ceannubháin
Mac Cance - MAc Aonais
(Mac) Candless - Mac Cuindlis
Candon - de Contún
Cane - Ó Catháin
Cangney - Ó Caingne
Mac Cann - Mac Cana
Canniff - Mac Connuibh
Canning - Ó Cainin
(Mac) Cannon - Mac Ceannannáin
(O) Cannon - Ó Canáin
(Mac) Canny - Mac Annaidh
(O) Canny - Ó Cainnia
Cantillon (Cantlin) - Cantalún
(de) Canton - de Cantún
Cantwell - Cantual
(O) Canty - Ó Cáinte
(Mac) Canuff - Mac Connuibh
Capeless - Caplais
Mac Cappin - Mac Ailpín
Cappock - de Ceapóg
Carabine - Ó Coirbín
Caraher - Mac Fhearchair
(Mac) Carberry - (Mac Cairbre)
(O) Carberry - Ó Cairbre
Cardiff - de Carduibh
(Mac) Cardle - Mac Adrail
Cardin - Cairdín
Cardwell - Mac Ardail
Caren - Ó Carraín
Carew - Carrún
(O) Carey - Ó Ciara
(Mac) Cargill - Mac Fheargall
Cargin - Ó Carragáin
Carhill - Mac Fheargail
Carigan - Ó Carragáin
Carleton - Ó Cairealláin
(Mac) Carley - Mac Fhearaile
(O) Carlin - Ó Cearúlláin
Carlos - Mac Cathail
Carlton - Mac Cearbhaill
Carmichael - Mac Giolla Mhichíl
Carmody - Ó Ceamada
Carnahan - Ó Cearnacháin
Mac Carn- Mac Cearáin
Mac Carney - Mac Cearnaigh
(O) Carney - Ó Cearnaigh
Carnohan - Ó Cearnacháin
Mac Carnon - Mac Thiornáin
Carns - Ó Céirín
Carolan - Ó Cearúlláin
Mac Caron - Mac Carramhna
Carpenter - Mac an tSaoir
Carr (Gaillimh) - Ó Ceara
Carr (Muineachán) - Mac Giolla Arraith
Carr (Tír Chonaill) - Mac Giolla Cheara
(O) Carr - Ó Carra
(Mac) Carraher - Mac Fhearchair
Mac Carrell - Mac Fhearchail
Carrick - Mac Concharraige
(Mac) Carrig - Mac Concharraige
(O) Carrigan - Ó Corragáin
Carrigee - MAc Concharridge
Mac Carrison - Mac Corsain
Carrocan - Ó Corragáin
Mac Carrogher - Mac Fhearchair
(O) Carroll - Ó Cearúill
Mac Carroll - Mac Cearúil
Carrolly - Mac Fhearaile
Mac Carron - Mac Cearáin
(Mac) Carry - Mac Fhearaigh
(O) Carry - Ó Carraidh
Carson - Mac Corsain
Mac Cart - Mac Airt
Mac Cartan - Mac Artáin
Carter - Mac Artúir
(Mac) Cartha - Mac Cárthaigh
Mac Carthur - Mac Artúir
Mac Carthy - Ó Cárthaigh
O’Carthy - Ó Cárthaigh
Mac Cartin - Mac Artáin
Mac Cartney - Mac Cartaine
Carton - Mac Artáin
(O) Carty - Ó Cárthaigh
Carvan - Ó Cearbháin
Carver - Gearrthóir
Mac Carvey - Mac Cearbhaigh
(Mac) Carvill - Mac Cearbhaill
Carvin - Ó Cearbháin
Mac Cary - Mac Fhearaigh
(Mac) Casement - Mac Asmaint
Mac Casey - Mac Cathasaigh
O’Casey - Ó Casthasaigh
Cash - Ó Cais
Cashel - Ó Caisil
Cashel - Ó Maolchaisil (An Clár)
(Mac) Cashin - Mac Caisín
Cashlan - Ó Caisealáin
Cashman - Ó Ciosáin
Caskey - Mac Ascaidh
Casley - Ó Casaile
(O) Caslin - Ó Caisealáin
Cass - Cas
Cassan - Mac Casáin
Cassel - Ó Caisil
(Mac) Casserley - Mac Casarlaigh
Cassian - Mac Caisín
(O) Cassidy - Ó Caiside
Cassily - Ó Casaile
Cassin - Ó Caisín
Mac Cateer - Mac an tSaoir
Cattigan- Mac Aitigín
Mac Caulfield - Mac Cathmhaoil
Caufield (Maigh Eo) - Mac Conghamhna
Mac Caughan - Mac Eacháin
O’Caughan - Ó Catháin
Mac Caugherty - Mac Eafarcaigh
(Mac) Caughey - Mac Eachaidh
Mac Caughley - Mac Eachmhile
Caughran - Ó Cogaráin
Mac Caul - Mac Camhaoil
Mac Cauley - Mac Amhalaí
(Mac) Caulfield - Mac Cathmhaoil
Caulin - Ó Cathaláin
Mac Causlan(d) - Mac Caisealáin
Cavan - Ó Caomháin
Mac Cavana - Mac an Mhanaigh
Cavanagh - Caomhánach
Cave - Mac Dháibhí
(Mac) Cave(y) - Mac Dháibhidh
Cavendish - Ó Ciabháin
Mac Cavera - Mac Aimhréidh
Mac Cavert - Mac Eafartaigh
Mac Cavery - Mac Gafraidh
(Mac) Cavish - Mac Thamhais
Caviston - Mac Aibhistín
Mac Cavitt - Mac Dhaibhéid
Mac Cavock- Mac Dhabhóg
Mac Caw - Mac Ádhaimh
Mac Cawell - Mac Camhaoil
(Mac) Cawley - Mac Amhalaí
Cawlin - Ó Cathaláin
Mac Cay - Mac Aodha
(O) Cevlehan - Ó Cibhleacháin
Chaff - Ó Lócháin
Chalmers - Sealmair
Chamberlain - Seambar
Chambers- Mac Ambróis
Charles - Mac Cathail
Charleson - Mac Séarlais
Charleton - Mac Cathail
Chavasse - de Ceabhsa
Cheasty - Ó Siosta
Cheevers - Síbhear
Cheyne - Mac Seáin
Chisholm - Siseal
Chivers - Síbhear (Muineachán)
Christian - Mac Cristin
Christie - Mac Críosta
Christopher - Críostóir
Christpherson - Mac Críostóra
Mac Chrystal - Mac Criostail
Church - Eaglais
Chute - Siúit
(O) Clabby - Ó Clabaigh
Mac Clafferty - Mac Laifeartaigh
(O) Claffey - Mac Laithimh
(Mac) Clafflin - Mac Giolla Sheachlainn
Clahane - Ó Clatháin
Mac Clamon - Mac Laghmainn
(Mac) Clancy - Mac Lannchaidh
Clandillon - Clanndiolún
Claplin - Mac Lochlainn
Clare (Cear) Ó Cléirigh
Clarkin - Ó Cléireacháin
Clarkin (s) - Ó Cléirchín
Clarkson - Mac an Chléirigh
Mac Clarnon - Mac Giolla Earnáin
Mac Clary- Mac Giolla Arraith
Clas(h)by - Mac Giolla Easpaig
Mac Clatchey - Mac Giolla Eidich
Mac Clatton - Mac Giolla Chatáin
Clausson - Mac Niocláis
(O) Clavan- Ó Clamháin
Mac Clave - Mac Laithimh
(O) Clavan - Ó Clamháin
Mac Clavish - Mac Giolla Shámhais
(Mac) Clay - Mac an Lia
Clayton - de Cléatún
Mac Clean- Mac Giolla Eáin
Clear - Ó Cléirigh
Mac Cleary - Mac Giolla Arraith
Cleeland - Mac Giolla Aoláin
Cleere - de Cléir
Clehane - Ó Clatháin
Mac Clelland- Mac Giolla Aoláin
Mac Clement - Mac Laghmainn
Mac Clenaghan - Mac Leannacháin
Mac Cleod - Mac Leoid
(O) Clerihan (Clerian) - Ó Cléireacháin
O’Clerkin - Ó Cléirchín
(O) Clery- Ó Cléirigh
Mac Clery - Mac Cléirigh
Mac Clew - Mac Dhoinnléibhe
Clifford - Ó Clúmháin
Clifferty - Mac Raifeataigh
Clifford (Fear Manach) Mac Rifeartaigh
Cligott - Mac Uileagóid
Mac Climmond (Mac Clammon) - Mac Laghmainn
Clinane - Ó Claonáin
Clinch - Clinse
Clinchy - Mac Loingsigh
Cline - Mac Giolla Chlaoin
Mac Clintock - Mac Giolla Ionntóg
Clinton - Cliontún
(Mac) Clinton - Mac Giolla Fhiontáin
Clisham - Mac Cliseam
Clogan - Ó Clochacháin
Clogher - Mac Clochair
(O) Cloherty - Ó Clochartaigh
Clohery - Ó Clochaire
(O) Clohessy - Ó Clochasaigh
(O) Cloney(y) - Ó Cluanaigh
Mac Cloon - Mac Giolla Eoin
(O) Clonnan - Ó Cluanáin
Cloran - Mac Labhráin
Mac clory- Mac Labhraí
Close - Ó Cluasaigh
Mac Closkey - Mac Bhloscaidh
Clossick - Mac Lusaigh
Clossy - Ó Clochasaigh
Mac Cloughry - Mac Clochaire
Clovan - Ó Clúmháin
Clowney - Ó Cluanaigh
Clowry - Mac Labhraí
(Mac) Cloy - Mac Dhoinnléibhe
Mac Cloy- MacLuaidh (Aontroim)
Clucas - Mac Lúcáis
Mac Cluggage - Mac Lúcáis
Mac Clughan - Mac Clúcáin
(Mac) Clune - Mac Clúin
Mac Clune- Mac Glúin
Mac Clune - Mac Giolla Eoin (Thuaidh)
Mac Clung - Mac Loinge
(Mac) Clure - Mac Giolla Uír
Mac Clurg - Mac Luirg
Clusby - Mac Giolla Easpaig
Clusker - Mac Bhloscaire
(O) Cluvane - Ó Clúmháin
Clymonds - Mac Laghmainn
Clynes - Mac Giolla Chlaoin
Cloady - Mac Óda
Coakley - Mac Caochlaoich
Mac Coan - Mac Comhain
Coats - Cat
Coburn - Mac Conboirne
Cochrane - Mac Cogaráin
Codd - Mac Óda
Cody - Mac Oda
Codyre - Iarsach
Coen - Ó Cadhain
(O) Coey - Ó Cobhaigh
(O) Coffey - Ó Cofaigh
Cogan - de Cógan
(Mac) Cog(g)an - Mac Cogáin
Co(o)gan - Ó Cuagáin
(Mac) Cogavin - Mac Cogaidhín
(Mac) Coggeran - Mac Cogarain
Coggins - de Cógan
Coghlan - Ó Cochláin
Coghran - Ó Cogaráin
(O) Coghley - Ó Coigligh
(O) Cohalan - Ó Cathaláin
(O) Cohane - Ó Ceocháin
Coid - Mac Uaid
Coiles - Mac Dhúghaill
Cokely - Mac Caochlaoich
Colahan - Mac Uallacháin
(Mac) Colavin - Mac Conluain
Colbert - Colbard
Colclough - Mac Caochlaoich
Coldrick - Mac Ualghairg
Coldwell - Mac Conluain
(Mac) Cole Mac Comhaill
Coleman - Ó Colmáin
Colfer - Coilféir
(Mac) Colgan - Mac Colgan
Colhoun - Ó Cathluain
Coligan - Mac Colgan
Colivan - Mac Conluain
Coll - Mac Colla
Collatan- Ó Collatáin
(Mac) Colleary - Mac Giolla Laoire
Collen- Mac Coilín
Collendar - Cuileandar
(O) Colleran - Ó Callaráin
Collery- Mac Giolla Arraith
Colley - Ó Colla
Collier - Coiléir
Colligan - Ó Colgan
Mac Collin - Mac Cuilinn
Colliney - Mac an Laighnigh
Collins - Ó Coileáin
Collins (Ulaidh) - Mac Coileáin
(Mac) Colliton - Mac Collatáin
O’Collopy - Ó Colpa
Collum - Mac Colaim
(Mac) Colman - Mac Colmáin
(O) Colman - Ó Colmáin
Cologhty - Ó Conlachta
Colohan - Mac Uallacháin
Colquhoun - Colchún
Mac Colreevy - Mac Cathail Riabhaigh
Conaghan - Ó Connacháin
Mac Collough - Mac Colla
Mac Collyams - Mac Uilliam
(O) Colter (Coulter) - Ó Coltair
Colthurst - Colltis
Colton - Ó Comhaltáin
(Mac) Colum - Mac Colaim
Colvan - Mac Conluain
Colville (Colwan) Mac Conluain
Colville (Coldwell) - O hUaruisce
Colwell - Mac Conluain
(O) Coman - Ó Comáin
Mac Comb Mac Thom
Comba - Ó Conbá
Comber (Comer) - Ó Ciaragáin
Comerford - Mac Cumascaigh
Comerton - Comartún
(Mac) Comesky - Mac Cumascaigh
Comey - Mac Giolla Chóimdhe
Mac Comick - Mac Thómaic
Comish - Mac Thomáis
(Mac) Comiskey - Mac Cumascaigh
Mac Comley - Mac Camlaoich
Mac Comming - Mac Coimín
Common(s) - Ó Comaín (Mumhain)
Common(s) - Ó Coimín
Comyn - Ó Ciumín
Mac Cona - Mac Dhonncha
(O) Con(a)boy - Ó Conbhuí
Conacher - Mac Conchúir
(O) Conaghan - O Connagháin
Mac Conaghy (Mac Conkey) - Mac Dhonnchaidh
Conalty - Ó Conallta
Mac Conamy - Mac Conmidhe
(O) Conan (Coonan - Ó Cuanáin
Conarchy - Ó Conairce
(O) Conary - Ó Conaire
(O) Conaty - Ó Connachtaigh
Conba - Ó Conba
(Mac) Conborne - Mac Conboirne
Concagh (Battle) - Mac Concatha
(O) Concannon - Ó Concheannainn
Mac Conchie - Mac Dhonnchaidh
Condon - Condún
Condrick - Mac Eanraic
(O) Condron - O Conaráin
Mac Cone (Coan) - Mac Comhain
(Mac) Conefry - Mac Confraoich
Coney - Ó Cuana
Conheady - Mac Con Éidigh
Mac Congail - Mac Congail
Mac Congigly - Mac Congaile
(Mac) Conheeny - Mac Conanaonaigh
Conify - Mac Dhonnchaidh
Mac Conkey - Mac Dhonnchaidh
(O) Conlan - Ó Conalláin
(Mac) Conley - Mac Connla
Conliff - Ó Connuibh
(O) Conliss - Ó Cuinlis
(Mac) Conlogue - Mac Conaill Óig
Mac Conloy - Mac Dhoinnléibhe
Mac Conmee - Mac Conmidhe
Mac Conn- Mac Mhíolchon
Mac Connagher - Mac Conchúir
Mac Connan - Mac Canann
Mac Connan- Mac Conéin (Muineachán)
(O) Connaughton - Ó Connachtáin
Connaughty - Ó Connachtaigh
(Mac) Connelly - Mac Conaola
Conneff - Mac Connuibh
Mac Connell - Mac Dhónaill
(O) Connell - Ó Conaill
(O) Connellan- Ó Conalláin
Mac Connellogue - Mac Conaill Óig
(O) Connelly - Ó Conghaile
Conneely/MacNeela/MacAnnelleye
Mac Conghaola in Galway which generally became
Conneely,
Mac Conghaile was to be found in the same county
MacNeeley
Mac Con Fhilidh Ulster, Donegal
Connerney - Mac an Airchinnigh
Connerton - Ó Connachtáin
Mac Connerty - Mac Connachtaigh
(O) Connery - Ó Conaire
(O) Conney - Ó Coinne
Connick - Mac Conmhaic
Conniff - Mac Connuibh
Connigan - Ó Connagáin
Connington - Ó Connachtáin
Connison - Mac Coinnigh
Connole - Ó Coineoil
(O) Connolly - Ó Conghaile
Ó
Conghóile in north Maigh Eo/Mayo;
Mac Conghalaigh in north Sligo and north Leitrim, native speakers
of the 19 cent. calling them 'Á Crollaigh';
Ó Conghaile was an origin of Connolly in Monaghan;
Ó Conghalaigh in Meath;
Ó Conghaile was at Loch Éirne, Fermanagh, being
comharba Molaissi;
Ó Conghalaigh in the east of County Galway
Ó Conngheallaigh West Cork
Mag Donghaile South Leitrim
Mac Connon
- Mac Canann
Mac Connor - Mac Conchúir
(O) Connor - Ó Conchúir
Connorton - Ó Connachtáin
(Mac) Connulty - Mac an Ultaigh
Mac Conohy - Mac Dhonnchaidh
(O) Conole - Ó Coineoil
Conoo - Ó Connmhaigh
(O) Conrahy - Ó Conratha
(O) Conran - Ó Conaráin
Mac Conready - Mac Conriada
(O) Conree - Ó Conraoi
Conrick - Mac Anraic
(O) Conroy - Ó Conraoi
(O) Conry - Ó Conaire
(Mac) Considine - Mac Consaidín
Mac Consnave - Mac Consnámha
(Mac) Convery - Mac Ainmhire
(Mac) Convey - Mac Connmhaigh
Mac Conville - Mac Conmhaoil
Conway (Mac Conamy) - Mac Conmidhe (An Cairdinéal
Liam Mac Conmidhe)
Conway - Ó Conbhuí
(Mac) Conwell - Mac Conmhaoil
Conyeen - Ó Coinín
Conyers - Ó Conchúir
Conyngham - Ó Connagáin
Mac Coo - Mac Aodha
Mac Cooey - Mac Cumhaí
Mac Coog - Mac Cuag
(O) Coogan - Ó Cuagáin
(Mac) Cooghan - Mac Cuacháin
Mac Cooke - Mac Dhabhóc
Mac Cool - Mac Giolla Chomhaill
Coole - Mac Dhúghaill
Cooley - Ó Cúille
(Mac) Cooley - Mac Cúille
(O) Coolican (Coolghan) - Ó Cúlacháin
Cooling - Ó Cúilinn
Coolson - Mac Cumhaill
Coomey - Ó Camtha
(O) Coonaghan (Counihan) Ó Cuanacháin
(O) Coonan - Ó Cuanáin
Coonerty - Ó Cuanartaigh
(O) Cooney - Ó Cuana
Coonlaghty - Ó Conlachta
Cooper Cúipéir
Coote - Cút
Copley - Cóiplí
Coppinger - Coipingéir
Corbally - de Corbhaile
(O) Corbane - Ó Corbáin (Mumhain)
Corbett - Ó Coirbín
Corbin - Ó Coirbín
(Mac) Corboy - Mac Corrbuí (Laois)
Corby - Ó Corrbuí
Mac Corcodale - Mac Thorcadail
(Mac) Corcoran - Mac Corcráin
(O) Corcoran - Ó Corcáin
Mac Cord - Mac Cuairt
Cordon - Ó Corradáin
Cordue (Corduff) - Corrdubh
(Mac) Corduff - Mac Corrduibh
Corduff - Ó Corrduibh
Corey - Ó Comhraí
(Mac) Corish - Mac Fheorais
(Mac) Corkell - Mac Thorcaill
Corken - Ó Corcáin
(O) Corkery - Ó Corca
Corkin - Ó Corcáin
(Mac) Corless - Mac Carlais
Corley - Mac Thoirealaigh
(O) Cormacan - Ó Cormacáin
(Mac) Cormack - Mac Cormaic
(Mac) Cormican - Mac Cormacáin
Mac Cormilla- Mac Gormaile
Corneen - Ó Coirnín
Mac Coroadale - Mac Thorcadail
(O) Corr - Ó Corra
Corran - Ó Corráin
(O) Corribeen - Ó Coirbín
(O) Corridon - Ó Corradáin
(O) Corrigan - Ó Corragáin
Mac Corrikle - Mac Thorcaill
(Mac) Corriston - Mac Orraistín
(Mac) Corry - Mac Gorthraigh
(O) Corry (Coary) - Ó Corra
Corscadden - Corscadán
Corvin - Ó Coirbhín
Mac Cosbey - Mac Ospaic
Coscar - Mac Oscair
(Mac) Cosgrave - Mac Coscraigh
(O) Cosgrave - Ó Coscraigh
Cosgrove - Mac Oscair
Mac Cosh - Mac Coise
Mac Coskar - Mac Oscair
Coskeran - Ó Coscracháin
Coskerry - Ó Coscraigh
(Mac) Costello(e) - Mac Coisteala
(Mac) Costigan - Mac Oistigín
Costin - Mac Oistín
Costley (Costello) - Mac Coisteala
Costum (Costune) - Costún
Cott - Cat
(Mac) Cotter - Mac Oitir
(O) Cottle - Ó Coitil
(Mac) Cottier(s) - Mac Oitir
Cotton - de Cotún
Mac Coubrey - Mac Cúibreith
Mac Coughey - Mac Eochaidh
(Mac) Coughlan - Mac Cochláin
(O) Coughlan - Ó Cochláin
Mac Coughran - Mac Cogaráin
Coulahan - Ó Cúlacháin
(O) Coulter - Ó Coltair
Coulton - Ó Comhaltáin
(O) Counihan - Ó Cuanacháin
Mac Counley - Mac Anlaoidh
County (Canty) - Ó an Cháinte
(de) Courcey - de Cúrsa
Courigan - Ó Corragáin
Cournane - Ó Curnáin
Courneen - Ó Coirnín
Mac Court - Mac Cuarta
Courtayne - Mac Curtáin
Courtney - Ó Curnáin
Cousins - Cúisín
Couvaddy - Mac an Mhadaidh
(Mac) Coveney - Mac Coibheanaigh
Mac Covera - Mac Cúibhréith
Mac Covey - Mac Cofaigh
Mac Cowan - Mac Comhain
(O) Cowan - Ó Comhain
Cowen - Ó Ceocháin
(O) Cowhig (Cowhey) - Ó Cothaigh
(Mac) Cowhill - Mac Cathmhaoil
(Mac) Cowley - Mac Amhalaí
Cowman - Ó Comáin
(Mac) Cowman - Mac Comáin
Cowmey - Ó Comtha
Mac Cownley - Mac Anlaoidh
Cowper - Cúipéir
Cowran - Ó Cubhráin
Cox - Mac an Choiligh
Cox - Mac Colgan - Corcaigh)
Mac Coy - Mac Aodha
Mac Coy - Mac Eachaidh (Tir Eoghain)
Coyd - Mac Uaid
(Mac) Coyle - Mac Giolla Chomhaill
(O) Coyne - Ó Cadhain
Coyne (Kilcoyne) - Mac Giolla Chaoin
Craan - Ó Corráin
Mac Cracken - Mac Reachtain
Craddock - Cradóc
Crahan - Ó Carráin
Crahan - Mac Criomhthainn (Ciarraí)
Craig - de Creag
Mac Crail - Mac Réill
Crain - Ó Carráin
Mac Crainor - Mac Thréinir
Mac Craith - Mac Craith
Crampsey - Ó Cnáimhsí
Mac Cran - Mac Bhroin
Crangle - Mac Ránaill
Cranley - Ó Crónaile
(Mac) Cranny (Creaney) - Mac Bhranaigh
Cravane (Craven) - Ó Crábháin
Craw - Mac Raith
Crawford - Mac Raith
Crawford - Mac Crábhagáin
Crawley - Mac Rállaigh
Mac Crea - Mac Craith
Mac Cready - Mac Riada
Creagh - Craobhach
Creaghan - Ó Críocháin
Creamer (Cramer) - Mac Thréinir
(O) Crean (Crynes) - Ó Croidheáin
(Mac) Creanor - Mac Thréinir
Mac Creary - Mac Ruairí
Creaton - Ó Créacháin
Creavan - Ó Cráibhín
Creed(on) - Ó Críodáin
(O) Creegan - Ó Croidheagáin
Creely - Mac Raghallaigh
Mac Creery - Mac Ruarí
Mac Creesh - Mac Raois
Mac Creevy - Mac Riabhaigh
Cregan - Ó Criagáin
(Mac) Cregan - Mac Raigáin
Cregg - de Creag
(O) Crehan - Ó Croidheáin
Mac Creight - Mac Creacht
Creighton - Mac Críocháin
(O) Cremin - Ó Croimín
(O) Crennon - Ó Crionáin
Crenegan - Ó Crionagáin
(Mac) Cribben - Mac Roibín
Crichton - Mac Críocháin
Crickard - Mac Riocaird
Cricket - Mac Ricéid
Mac Crifferty - Mac Rifeartaigh
Crigley - Mac Raigilligh
(Mac) Crilly - Mac Raghallaigh
Mac Crimmon - Mac Cruimein
Mac Crindle - Mac Ránaill
Crinigan - Ó Crionagáin
Crinion - Ó Críonáin
Mac Crink - Mac Fhrainc
Crisham - Mac Cliseam
Mac Criskin - Mac Cristin
Cristy - Mac Críosta
(O) Croffy - Ó Cráfaigh
Crofton - de Crochtún
Crofts - de Crochtas
Mac Croghan (Croan) - Mac Conchruachan
Mac Crohan - Mac Criomhthainn
Crohore - Ó Crothair
Croke - Cróc
Croker - Crócar
Crolly - Mac Raghallaigh
Croimie - Ó Cromtha
Cromwell (Grummell) - Cromail
Cronan - Ó Crónáin
Crone - Ó Cróin
Cronehan - Ó Crónagáin
Cronelly - Ó Crónaile
Croniken - Ó Crónagáin
(O) Cronin - Ó Cróinín
Crook - Cróc
Mac Crorken - Mac Ruarcáin
Mac Crory - Mac Ruairí
Crosbie - Mac an Chrosáin
Cross - Mac an Chrosáin
Mac Crossan - Mac an Chrosáin
(O) Crotty - Ó Crotaigh
Crough - Mac Conchrú
(Mac) Croughan (Crowne) - Mac Conchruachan
Crowe - Mac Conchra
Crowe (Crough) - Mac Conchrú
(O) Crowley - Ó Crualaoich
Crozier - Crúiséir
Mac Crub - Mac Rob
Mac Crudden - Mac Rodáin
Cruise - de Crúis
Mac Crum(b) - Mac Croim
Crumley - Ó Cromlaoich
Crumlish - Mac Cromroisc
Crummell - Cromail
Crummy - Ó Cromtha
(O) Cryan - Ó Croidheáin
Cryan - Ó Craoirinn
Mac Crystal - Mac Criostail
Cubbon - Mac Giobúin
Mac Cubrae - Mac Cúibreith
Cudd - Mac Uid
Mac Cudden - Mac Cadáin
(O) Cuddigan - Ó Ceadagáin
(O) Cuddihy - Ó Cuidithe
Mac Cue - Mac Aodha
Cuffe - Mac Dhuibh
(Mac) Cuggeran - Mac Cogaráin
Cuhy - Mac Eochaidh
O’Cuill - Ó Coill
Cuinane - Ó Cuineáin
Culhane - Ó Cathláin
(O) Culhoun - Ó Cuiliúin
Culkin - Mac Uilcín
Cull - Mac Colla
Mac Culla - Mac Colla
Mac Cullagh - Mac Cú Uladh
Cullanan - Ó Cuileannáin
(O) Cullane - Ó Coileáin
Culleeny - Mac an Laighnigh
(Mac) Cullen - Mac Cuilín
(O) Cullen - Ó Cuilinn
(Mac) Culleton - Mac Collatáin
Cullian - Ó Cuilinn
Culligan - Ó Colgan
(O) Culligan - Ó Cuileagáin
(O) Cullinane - Ó Cuileannáin
Culliney - Mac an Laighnigh
Cullington - Ó Collatáin
Mac Cullion- Mac Coileáin
Culliton - Ó Collatáin
Cullivan - Mac Conluain
Colloon - Ó Cuiliuin
(O) Culloty - Ó Collata
Mac Cullow - Mac Cú Uladh
Mac Cullum - Mac Colaim
Mac Cully - Mac Colla
(O) Cully - Ó Colla
Mac Cullyam - Mac Uilliam
(Mac) Culreavy - Mc Cathailraibhaigh
Cummane - Ó Comáin
Mac Cumming(s) - Mac Coimín
Cumming(s) - Ó Comáin
Cumming(s) - Ó Coimín
Mac Cumiskey - Mac Cumascaigh
(O) Cundlish - Ó Cuindlis
Mac Cune - Mac Eoin
Cunhane - Ó Conáin
Cunlaghty - Ó Conlachta
Cunlisk - Ó Cuinlis
Cunnagher - Mac Conchúir
Cunnane - Ó Cuinneáin
(O) Cunnea - Ó Coinne
Mac Cunneela - Mac Conaola
(Mac) Cunneen - Mac Coinín
(O) Cunneen - Ó Coinín
Cunneeny - Mac Conaonaigh
Mac Cunnegan - Mac Cuinneagáin
(O) Cunnegan - Ó Connagáin
Mac Cunniff - Mac Connuibh
Cunning - Ó Conaing
Cunningham - Mac Cuinneagáin
Cunnion - Ó Coinín
Mac Cunny - Mac Connaidh
(O) Cunny - Ó Coinne
Cunree - Mac Conraoi
Cunreen - Mac Conriain
Cunvane - Ó Conbháin
Mac Cuolahan - Mac Uallacháin
(O) Cuolahan - Ó Culacháin
Mac Curdy - Mac Mhuireartaigh
Mac Cure - Mac Iomhair
Curland - Ó Coirealláin
(Mac) Curley - Mac Thoirealaigh
(O) Curnane - Ó Curnáin
(O) Curneen - Ó Cuirnín
(Mac) Curphy - Mac Mhurchaidh
Curragh - Corrach
(O) Curran(e) - Ó Corráin
Curren - Mac Corraín
Curreen - Ó Cuirín
(Mac) Curreen - Mac Corraín
(O) Currid - Ó Corthaid
Mac Currie - Mac Mhuirí
(O) Currigan - Ó Corragáin
(Mac) Curristin - Mac Orraistín
(O) Currobeen - Ó Coirbín
Mac Curry - Mac Gothraidh
(O) Curry - Ó Camhraí
Mac Curtain - Mac Curtáin
Curtayne - Mac Curtáin
(Mac) Curtin - Mac Cuirtín
Curtis - de Cuirtéis
Cusack - Cíosóg
Cush - Mac Coise
Mac Cushen - Mac Oisín
Cushing (Cushion) - Cúisín
Crushlane - Ó Caisealáin
(Mac) Cushley (Cuskley) - Mac Giolla Choiscle
(O) Cushnahan - Ó Cosnacháin
(Mac) Cusker - Mac Oscair
Cuskern - Ó Coscracháin
Mac Cuskern - Mac Coscracháin
Mac Cuskin - Mac Uiscín
Cussane - Ó Cosáin
Cussen (Cushen) Cúisín
(Mac) Custy (Hosty) - Mac Oiste
Mac Cutcheon - Mac Úistín
Cuthbert(son) - Mac Cúibreith
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