Mac Giolla Choiscle
Mac GIOLLA CHOISCLE—IV—M'Gillecosgelie, M'Gilkuskley, M'Gilkuslie, Cuskley, Cushley, Cuskelly, (Costello, Cosgrave, Cosgrove); 'son of Giolla choiscle' (lad of the left leg); an old surname in Fermanagh, Monaghan and Offaly; sometimes, but less correctly, written Mac Giolla choiscligh.
Alphabetical Index to Irish Surnames