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Cognomen Nishiumi (西海 , Nishiumi ) , all over the world, is a rare last name. The last name Nishiumi is characteristic of China, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and Peru. In absolute terms, the name is most common in China, the United Kingdom, and the United States. More prevalently, Nishiumi is the forename as well as the last name.