Ó Cathmhogha
Ó CATHMHOGHA—I—O Cowhow, Coffey; 'descendant of Cathmhugh' (battle-slave); a rare surname in south-west of Co. Galway; to be distinguished from Ó Cobhthaigh of the same county. The family is of the same stock as the O'Clerys and O'Heynes.
Alphabetical Index to Irish Surnames