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Surname Kasto (Kasto , Schachtel ) , around the world, is quite a rare last name. The last name Kasto is habitual in Suriname, where it is quite a common surname, Sweden, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it most frequently occurs in Indonesia, the United States, and Argentina. More frequently, Kasto is the forename as well as the last name.