Gilmour name origin

Some possible derivations

1. Scottish and Irish (Ulster): reduced Anglicized form of Gaelic Mac Gille Mhoire (Scots), Mac Giolla Mhuire (Irish), patronymics from personal names meaning ‘servant of (the Virgin) Mary’.
2. Irish: in Armagh, reduced Anglicized form of Gaelic Mac Giolla Mhura ‘servant of St. Mura (of Fahan, Donegal)’ or, in Sligo, of Mac Giolla Mhir ‘son of the spirited lad’.

Motto: ‘Nil penna usus’ – i.e. ‘Not the quill but its use’

Gillemore, Gaelic, the henchman or follower of the chief, one who carried the chief’s broadsword, from gille, a servant, and mor, large, great.