Ó Móráin
Ó MÓRÁIN—I—O Moraine, O Morane, O Moran, Moran; 'descendant of Mórán' (diminutive of mór, great); the name of a branch of the Ui Fiachrach, in the present counties of Mayo and Sligo, who ruled over an extensive district on both sides of the river Moy, and were a highly respectable family. The chief resided at Ardnaree, near Ballina. This surname is to be distinguished from Ó Mughróin (which see), which is also anglicised Moran. O'Moran was a common surname in the 16th century in all parts of Connacht and Leinster, and also in Ormond and Thomond.
Alphabetical Index to Irish Surnames