Ó Cárthaigh
Ó CÁRTHAIGH—I—O Carhy, O Cartie, O'Carthy, Carthy, Carty, &c.; 'descendant of Cárthach' (loving). There were families of this name in Tipperary, Clare and Roscommon. The last-named family ramified into Longford, Sligo and Donegal. Three of the name are mentioned by the Four Masters as chief poets of Connacht in the 11th and 12th centuries. The name is still common in many parts of Ireland. To be distinguished from Mac Carthaigh, which see.
Alphabetical Index to Irish Surnames