Ó Gamhna
Ó GAMHNA—I—O Gawny, O Gawney, Gooney, Gaffney, (Caulfield); 'descendant of Gamhain' (calf); formerly common in Ormond, South Leinster, and North Connacht; now generally anglicised Gaffney, but sometimes disguised as Caulfield.
Alphabetical Index to Irish Surnames