Rattigan

Rattigan is a surname. It is an anglicised form of the Irish patronym Ó Reachtagáin, meaning "descendant of Reachtagán", whose name derives from the Old High German reht, meaning "justice". The name may vary as O'Raghtaghan, Raghtigan, Rhatigan, Ratigan, Rhategan, Ractigan, and Ratican.