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Cognomen Setoguchi (セトグチ , Setoguchi ) , all around the world, is a rare surname. The family name Setoguchi is characteristic of Costa Rica, where it is a rare surname, Canada, where it is a very rare surname, and Japan. Not in comparison with a country's population, the name is most common in Brazil, Japan, and Canada. More frequently, Setoguchi is the forename as well as the last name.