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Family name Tatumi (タツミ , Tatumi , 辰巳 ) , globally, is quite a rare last name. The last name Tatumi is characteristic of Japan, where it is quite a rare surname, Brazil, where it is an extremely rare surname, and Nigeria. Not in comparison with a country's population, the name is most common in Japan, Brazil, and China. More prevalently, Tatumi is the forename as well as the last name.