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Surname Kashiwagi (カシワギ , Kashiwagi , 柏木 ) , across the world, is a rare family name. The family name Kashiwagi is habitual in Singapore, where it is a rare surname, Japan, and Finland. Measured by absolute frequency, it most frequently occurs in Japan, the United States, and China. More frequently, Kashiwagi is the forename as well as the last name.