Ó Gríobhtháin
Ó GRÍOBHTHÁIN—I—O Greffane, O Grevan, Griffin, Greaven, Greven, (Griffith, Griffiths, Greaves, Grieves); 'descendant of Gríobhthán' (diminutive of Gríobhtha); a Connacht surname, found chiefly in Galway and Mayo.
Alphabetical Index to Irish Surnames