Mac Conchruachan
Mac CONCHRUACHAN—IV—M'Encroghan, M'Necroghan, M'Icrowghan, Croughan, Croghan, Crohan, Croan; 'son of Cú-Chruachan' (hound of Croghan, in Roscommon, Irish 'Cruachu,' gen. 'Cruachan'); an old Roscommon surname.
Alphabetical Index to Irish Surnames