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Surname Simizu (シミズ , 清水 , Simizu ) , worldwide, is quite a rare family name. The cognomen Simizu is habitual in Japan, where it is a rare surname, China, and Argentina, where it is a very rare surname. Not in comparison with a country's population, the name is most common in China, Japan, and Brazil. Much more frequently, Simizu is the forename as well as the last name.