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Last name Ostos (Ostos ) , throughout the world, is a common surname. The surname Ostos is habitual in Latin America and the Caribbean, particularly Aruba, where it is quite a common surname, Venezuela, where it is quite a rare surname, and Peru. Not in comparison with a country's population, it is commonest in Latin America and the Caribbean, particularly Colombia, Mexico, and Peru. Much less frequently, Ostos is the forename as well as the last name.