Ó Fuallacháin
Ó FUALLACHÁIN—I—O Foulohan, O Whologhane, Whoolahan, Whoolehan, Wholihane, &c.; 'descendant of Uallachán' (diminutive of uallach, proud); a variant of Ó hUallacháin, which see. The initial f is intrusive.
Alphabetical Index to Irish Surnames