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Scottish and Irish (Ulster and Galway): shortened Anglicized form of Gaelic Mac Gille Mhoire (Scots) Mac Giolla Mhuire (Irish) patronymics from personal names meaning ‘servant (i.e. devotee) of (the Virgin) Mary’. Irish: in Sligo shortened Anglicized form of Gaelic Mac Giolla Mhir ‘son of the spirited lad’. English: habitational name from Gillamoor in Rydale (North Yorkshire) from Old English Gedling (‘place called after Gētla’ from the Old English personal name Gētla + the connective particle -ing) + mōr ‘moor’.
Source: Dictionary of American Family Names 2nd edition, 2022