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Last name コスギ (コスギ , Kosugi ) , in the entire world, is a rare surname. The last name コスギ is habitual in Japan, where it is a rare surname, Switzerland, where it is a very rare surname, and Belgium. Measured by absolute frequency, this name is the most popular in Japan, Brazil, and Indonesia. More frequently, コスギ is the forename as well as the last name.