Mac Giolla Bhuidhe
Mac GIOLLA BHUIDHE—IV—M'Gilleboy, M'Gilboy, M'Gillavoye, M'Gillewy, MacGillowy, Magillowy, MacGilwee, MacGilvie, MacGilloway, MacGilway, MacKilvie, MacKelvey, MacIleboy, MacIlboy, MacIlbwee, MacIlwee, MacElwee, MacElvee, Mackilbouy, MacAboy, MacAvoy, MacEvoy, MacAvey, Gilboy, Gilvoy, Gilloway, Gilwee, Gilbey, Kilboy, Killby, Kilby, Kilvey, Ilwee, &c.; 'son of Giolla buidhe' (yellow lad). This surname originated in Co. Mayo, but in the 16th century it was common in Sligo, Leitrim and Donegal. Many of the name at present in Ireland are, no doubt, of Scottish origin. The popular form was often Mac 'a Bhuidhe; hence the anglicised forms MacAvoy, &c.
Alphabetical Index to Irish Surnames