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Cognomen Iwabuchi (Iwabuchi ) , in the entire world, is a rare last name. The cognomen Iwabuchi is characteristic of Cayman Islands, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Singapore. In absolute terms, this name is the most popular in Japan, Brazil, and the United States. Also, Iwabuchi is the forename as well as the last name.