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Last name 西谷 (Nishitani , 西谷 , Нисия ) , in the world, is a rare family name. The last name 西谷 is habitual in Hong Kong, where it is a rare surname, Japan, and Bulgaria. Measured by absolute frequency, it is the most numerous in Japan, Brazil, and the United States. Much less frequently, 西谷 is the forename as well as the last name.