Ui Briuin
UI BRIUIN, descendants of Brion, King of Connacht, son of Eochaidh Muighmheadhoin, King of Ireland, of whom there were different branches in Connacht and Breifney, as:—Ui Briuin Breifne, Ui Briuin Eola, Ui Briuin na Sionna, Ui Briuin Ratha.
Alphabetical Index to Irish Surnames