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Surname Basto (Bastos , Basto , Басто ) , across the world, is a widespread last name. The cognomen Basto is habitual in Portugal, where it is a common surname, Brazil, where it is quite a common surname, and Luxembourg (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Brazil, Portugal, and Colombia. Much less frequently, Basto is the forename as well as the last name.