Mac Giolla Chomhghain
Mac GIOLLA CHOMHGHAIN—IV—M'Gillchoan, MacIlhone, MacElhone, MacCowan, Cowan; 'son of Giolla Chomhghain' (servant of St. Comgan); also Mac Giolla Chomhdhain; a rare Ulster surname; also a Scottish surname.
Alphabetical Index to Irish Surnames