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Surname Damasio (Damasio , Damásio ) , in all the world, is a common cognomen. The surname Damasio is habitual in Aland Islands, where it is quite a common surname, Portugal, and Brazil, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Brazil, Portugal, and Mexico. Much less frequently, Damasio is the forename as well as the last name.