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Cognomen Rigau (Rigau , Риго ) , in the entire world, is quite a rare surname. The cognomen Rigau is habitual in Aland Islands, where it is quite a common surname, Uruguay, where it is quite a rare surname, and Spain, where it is a rare surname. In absolute terms, it most frequently occurs in Spain, the United States, and Argentina. Likewise, Rigau is the forename as well as the last name.