Ó hAinnín
Ó hAINNÍN—I—O Hanine, O Haneene, Hannin, Hanneen, Hannen, (Hannan, Hannon); 'descendant of Ainnín'; perhaps the same as Ó hAinchín, which see. Maelbhríghde Ua hAinnín, 'noble martyr of Ireland,' died in the year 1133.
Alphabetical Index to Irish Surnames