Ó Duinnchinn
Ó DUINNCHINN—I—O Dingine, O Dongyn, O Dongen, Dinkin, Dunkin, (Duncan); 'descendant of Donncheann' (Brown-head); an old Sligo surname; rare and often disguised as Duncan. Some of the family migrated to Leinster.
Alphabetical Index to Irish Surnames