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Family name Tsubone (Tsubone ) , in all the world, is a very rare surname. The cognomen Tsubone is habitual in Brazil, where it is a very rare surname, Canada, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Brazil, Canada, and the United States. More frequently, Tsubone is the forename as well as the last name.