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Family name Carreau (Karo , Carreau , Carou ) , around the world, is a common last name. The cognomen Carreau is habitual in Papua New Guinea, where it is quite a common surname, Indonesia, and Estonia, where it is quite a rare surname. In absolute terms, the name is most common in Indonesia, France, and Papua New Guinea. Likewise, Carreau is the forename as well as the last name.