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Family name 中谷 (Nakaya , Nakatani , 中谷 ) , around the world, is quite a rare last name. The last name 中谷 is habitual in Japan, where it is a rare surname, Kenya, and Brazil. Measured by absolute frequency, it most frequently occurs in Brazil, Japan, and the United States. Much less frequently, 中谷 is the forename as well as the last name.