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Surname Guerreiro (Guerreiro ) , across the world, is a common last name. The surname Guerreiro is characteristic of Portugal, where it is a common surname, Luxembourg, where it is quite a common surname, and Angola (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in Portugal, Brazil, and Angola. Very seldom, Guerreiro is the forename as well as the last name.