Ó Cuileannáin
Ó CUILEANNÁIN—I—O Cullanayne, O Cullinan, Cullinane, Cullinan, Quillinan, Culnane, Quilnan, (Callanane, Callanan), &c.; 'descendant of Cuileannán' (diminutive of Cuileann); the name (1) of a Co. Louth family who were anciently lords of Conaille; and (2) of a family of Corca Laoighdhe, formerly seated in the barony of Barryroe, in South Cork. Dr. O'Brien, in his Irish Dictionary, mentions another family of this name as lords of Muscraighe-tri-maighe, now the barony of Orrery, Co. Cork, but I have failed to trace it. There was also a remarkable family of the name in Tirconnell, to which belonged Dr. John O'Cullinan, Bishop of Raphoe at the period of the Confederation.
Alphabetical Index to Irish Surnames