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Surname 上月 (上月 , Kozuki , Kōzuki) , throughout the world, is a rare last name. The surname 上月 is habitual in Israel, where it is a rare surname, Canada, where it is a very rare surname, and Brazil. Measured by absolute frequency, it most frequently occurs in the United States, Brazil, and China. Also, 上月 is the forename as well as the last name.