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Surname Koshiro (Koshiro ) , globally, is a rare family name. The surname Koshiro is habitual in Japan, where it is a very rare surname, Cambodia, and the United States, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Japan, China, and the United States. More frequently, Koshiro is the forename as well as the last name.