Recorded in various spellings including O'Hagan, Hagan, Hagen, Haggan, Hagon, Hegan and Aiken, this is an Irish surname. Originally from the pre 10 th century Old Gaelic O'hAodhagain, meaning the "male descendant of Aodh", a personal name meaning "fire", Aodh was a pagan god worshipped by the early natives. The great O'Hagan clan originated in the province of Ulster, and the seat of its chief was at Tullahogue, County Tyrone. The chief exercised the hereditary right of inaugurating O'Neill as king or overlord of Ulster.
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