Ah, hehe. Well, mine is O'Callaghan :P Anywho - sorry for the random note, and I wish you good luck on whatever endeavors.
Probably was me. O'Callahan is mine, same lineage as Callaghan.
Know it's random - but were you the dude who I randomly talked to during the Naxx PTR? I remember meeting someone with your name there and you had asked me if Callaghan was my family name.