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Surname 国分 (Kokubu , Kokubun , 国分 ) , all over the world, is a rare last name. The last name 国分 is habitual in Japan, where it is a rare surname, Brazil, where it is a very rare surname, and Peru. Measured by absolute frequency, it is commonest in Japan, Brazil, and the United States. More frequently, 国分 is the forename as well as the last name.