Ó hEarnáin
Ó hEARNÁIN—I—O Hernane, O Harnan, O Hortenan, Hernon, Harnon, Hartnane, Hertnan, Hertnon, (Heffernan); (1) 'descendant of Earnán' (diminutive of earna, knowing, experienced); and (2) a short form in Munster of Ó hIfearnáin, which see.
Alphabetical Index to Irish Surnames