Ó Criocháin
Ó CRIOCHÁIN, Ó CRÍOCHÁIN—I—O Criaghan, O Creghan, Creghan, Creaghan, Creehan, Crehan, Creighan, (Creighton, Creaton), Creen, Crean; 'descendant of Criochán' (probably a variant of creachán; also a small person); the name of an Oriel family who were lords of Ui Fiachrach of Ardsratha, now Ardstraw, Co. Tyrone. In the 16th century it was found in all the counties of Munster, and in Kilkenny, Carlow and Dublin. See Ó Creacháin.
Alphabetical Index to Irish Surnames