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Family name Radeau (Ratis , Radel , Radou ) , all over the world, is quite a rare cognomen. The last name Radeau is characteristic of Liechtenstein, where it is quite a common surname, Greece, where it is quite a rare surname, and Austria. Not in comparison with a country's population, the name is most common in the United States, Brazil, and Algeria. Likewise, Radeau is the forename as well as the last name.