(where available) Scallan Early Origins Spelling variations of this family name include: Scallen, Scallan, Scullin, O'Scallan, O'Scallan, O'Scullin, McScallan and many more. First found in Wexford , where they held a family seat as a branch of Madigan clann. Traditionally they are descended from Fiacha Araidhe the 37th King of Ulster