Oakes
A Co. Antrim surname derived from the Irish word for an oak tree. |
Oates
A variant of the surname Quirke, which is derived from coirce the
Irish word for oats. |
Odell
An English surname introduced into Co. Limerick in the 17th Century
and sometimes incorrectly written O’Dell. |
Odlum
English surname with Germanic origins introduced into the midlands
in the 17th Century. There is a well-known Irish milling company
of that name. |
Ogan,
Oogan
A variant of Wogan in Cos. Louth and Dublin. |
Ogle
Introduced into Co. Louth in the mid-seventeenth century. |
Oliver
An Anglo-Norman surname introduced into Co. Louth in the early 14th
Century. Another family of the same name arrived from England and
settled in Co. Limerick in the 17th Century. |
Olligan
A variant of Halligan in Co. Kildare. |
Orahoe
A variant of Horohoe found in Co. Longford. |
Ormond
Originated on the Cork – Waterford border and derived from
the Irish word rua meaning ‘red’. The fact that it is
found in Ormond country is coincidental. |
Ormsby
A Lincolnshire family that settled in Co. Mayo in the late 16th
Century. Associated with north Connacht |
Orpen
Derived from an Old English word meaning ‘swarthy’ and
the name of an English family that settled in Co. Kerry in the mid-1600s.
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Orr
A Scottish family that settled in Ulster in the 17th Century. |
Osborne
An influential family that settled in parts of Cos. Waterford and
Tipperary in the mid-1500s. |
MacOscar
a variation of McCusker found in north Ulster. See Derry. |
Owens
Of Welsh origin, sometimes a synonym of McKeown and a variant of
Hynes and Hinds in Ulster, but not in the west. |
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