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Last name Yamagishi (ヤマギシ , Yamagishi , Ямагиши ) , around the world, is quite a rare cognomen. The cognomen Yamagishi is habitual in Hong Kong, where it is a rare surname, Japan, and Switzerland. Measured by absolute frequency, it is the most numerous in Japan, Brazil, and the United States. More frequently, Yamagishi is the forename as well as the last name.