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Surname Atso (Atso , Ацо , อัฐโส ) , in the entire world, is a rare last name. The surname Atso is characteristic of Estonia, where it is quite a rare surname, Finland, where it is a rare surname, and Nigeria, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Nigeria, Estonia, and Thailand. More frequently, Atso is the forename as well as the last name.