Mac Dhuarcáin
Mac DHUARCÁIN—IV—MacGurgan, Gurkin, Durcan, Durkan, Durkin, Zorkin; 'son of Duarcán'; the name of a well-known North Connacht family who were anciently lords of Cuil Neiridh, in Co. Sligo, and are probably a branch of the O'Haras. This surname is sometimes pronounced Ó Cuarcáin in the spoken language of Mayo.
Alphabetical Index to Irish Surnames