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Family name Riat (Riat , ريات , Риат ) , around the world, is quite a rare cognomen. The cognomen Riat is habitual in Switzerland, where it is quite a rare surname, North Macedonia, and Argentina, where it is a rare surname. In absolute terms, this name is the most popular in France, Switzerland, and Argentina. Likewise, Riat is the forename as well as the last name.