From Irish Names and Surnames 1923
Mac GIOLLA ÍOSA—IV—M'Illiosa, MacIleese, MacAleese, MacAleece, MacAlish, MacLeese, MacLees, Maclise, MacLeesh, MacGleish, MacCleish, Gilleece, Gillis, &c.; 'son of Giolla Íosa' (servant of Jesus); an Ulster surname; also a Scottish surname.
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Alphabetical Index to Irish Surnames
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