Gilmartin family genealogy
Arms: Ar. a sinister hand couped at the wrist affrontée gu.
FEARCAR, brother of Aodh Ornaighe who is No.97 on the "O'Neill" (of Tyrone) pedigree, was the ancestor of MacGiolla Marthain; anglicised Gilmartin, Kilmartin, and Martin.
97. Fearcar: son of Niall Frassach, the 162nd Monarch of Ireland.
98. Bearach: his son.
99. Maolgarbh: his son.
100. Cearnach: his son.
101. Donchadh: his son.
102. Dubhfionn: his son.
103. Giolla Marthain: his son: meaning "the devotee of St. Martin" ("marthain:" Irish, life); a quo MacGiolla Marthain.