Ó hUltacháin
Ó hULTACHÁIN—I—O Holteghan, Hultaghan, Hultahan, Haltigan, (Nolan); 'descendant of Ultachán' (diminutive of 'Ultach,' the Ultonian); a rare Fermanagh surname; often disguised under the anglicised form of Nolan.
Alphabetical Index to Irish Surnames