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Cognomen Cassimiro (Cassimiro ) , all around the world, is a common surname. The surname Cassimiro is characteristic of Brazil, where it is quite a rare surname, Portugal, where it is a rare surname, and Spain, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Brazil, Spain, and the United States. Very seldom, Cassimiro is the forename as well as the last name.