Ua Cobhthaigh, i. e. nepos Cobhthachi, now O'Coffey and O'Cowhig. The name Cobhthach denotes Victor or Victorious. The progenitor after whom the surname was called was Cobhthach Finn, son of Dunghalach, the twelfth in descent from Lughaidh Maccon. This family was seated in the barony of Barryroe, where Dun Ui-Chobhthaig still marks their ancient residence.