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Family name ナツミ (Natsumi , ナツミ , Natumi ) , all around the world, is a widespread surname. The surname ナツミ is characteristic of Japan, where it is quite a common surname, Indonesia, where it is a very rare surname, and Brazil. In absolute terms, this name is the most popular in Japan, Indonesia, and China. Much less frequently, ナツミ is the forename as well as the last name.