 The Oxford Dictionary of National Biography notes that the Irish surname Ó <unk> — frequently anglicised as " Broder " or " Broderick " — may be an amalgamation of the Irish element " Ó " ( " grandson of " ) and the Norse name Brodir . However , although Norse origins are often claimed for the surname , it has been on record in Ireland for centuries before the Anglo – Norman invasion . The name occurs most commonly in Munster and south @-@ east Leinster . 
