Ó Ruadháin
Ó RUADHÁIN—I—O Ruane, O Rowane, O Roan, Ruane, Rouane, Roane, Ruan, Roan, Roon, Rowan, Rewan, Royan, (Ryan); 'descendant of Ruadhán' (diminutive of ruadh, red); also Ó Ruaidhín; the name (1) of an old Mayo family of the Ui Fiachrach, who possessed a district lying between Newbrook and Killeen, to the north of Ballinrobe; and (2) of an old Galway family of the Ui Maine race. No fewer than seven of the name were bishops of various sees in Connacht, in the 12th and 13th centuries. The name is still very common in that province, generally anglicised Ruane, but sometimes disguised as Ryan.
Alphabetical Index to Irish Surnames