KILMARTIN Family History
Recorded in several spelling forms including MacGilmartin, McGilmartin, Gilmartin, Kilmartin and sometimes Martin, this is an Irish surname. It derives from the pre 10th century "Mac Giolla Mhartain", meaning the follower (giolla) of St. Martin, an early saint. The sept is a branch of the O'Neills of Fermanagh and Tyrone, being chiefs in the barony of Clogher, in County Tyrone. Those that moved into Connacht became Kilmartin. When combined together in all the spellings this surname is among the fifty most numerous names in Ireland.