Ó Murcháin
Ó MURCHÁIN—I—O Murchan, O Morghane, O Moraghan, Morahan, Morohan, Murchan, Morkan, Morkin, Murkin, (Morgan), Morran, Morrin, (Moran); 'descendant of Murchadhán' (diminutive of Murchadh, sea-warrior); the name (1) of an Offaly family who were formerly chiefs of Magh Aoife, in the barony of East Offaly, and are still numerous in Kildare and Offaly, but often disguised as Morrins and Morans; and (2) of a family of Ui Maine in Connacht. The name is not uncommon in Co. Leitrim.
Alphabetical Index to Irish Surnames