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Cognomen Koito (Koito ) , throughout the world, is a rare surname. The surname Koito is habitual in Papua New Guinea, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Brazil, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Papua New Guinea, the United States, and Brazil. More frequently, Koito is the forename as well as the last name.