Mac Thighearnáin
Mac THIGHEARNÁIN—IV—M'Kiernane, M'Kemane, MacKiernan, MacKernan, MacCarnon, MacHarnon, Kiernan, Kernan, Kernon, and, by translation, Lord; 'son of Tighearnán' (diminutive of 'tighearna,' a lord); the name (1) of a branch of the O'Connors in Co. Roscommon, who are descended from Tighearnán, grandson of Turlough Mor O'Connor, King of Ireland; (2) of a Breifney family, of the same stock as the O'Rourkes, who were formerly chiefs of Tellach Dhunchadha, now the barony of Tullyhunco, in the west of Co. Cavan; and (3) of a Fermanagh family, of the same stock as the Maguires, who were formerly chiefs of Clann Fearghaile. See Mac Tighearnáin.
Alphabetical Index to Irish Surnames