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Cognomen Cássio (Cassio , Cássio , كاسيو ) , all over the world, is quite a rare family name. The last name Cássio is habitual in El Salvador, where it is quite a rare surname, Angola, where it is a rare surname, and Portugal. In absolute terms, it most frequently occurs in Brazil, Mexico, and the United States. More frequently, Cássio is the forename as well as the last name.