Ó Gormáin
Ó GORMÁIN—I—O Gormane, O'Gorman, Gorman; 'descendant of Gormán' (diminutive of gorm, blue); a rare and scattered surname; to be distinguished from Mac Gormáin, which is often anglicised O'Gorman, as well as Gorman.
Alphabetical Index to Irish Surnames