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Cognomen Raio (Raio , Райо , رايو) , throughout the world, is quite a rare last name. The cognomen Raio is habitual in Portugal, where it is quite a rare surname, Chile, where it is a rare surname, and Italy. Not in comparison with a country's population, it most frequently occurs in Italy, the United States, and Brazil. Very seldom, Raio is the forename as well as the last name.