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Around the world, 繁雄 (Shigeo , 繁雄 ) is quite a rare gender-neutral first name. The forename 繁雄 is characteristic of Japan, where it is quite a rare epicene name, the United States, where it is a very rare predominantly boy's, but scarcely female name, and China, where it is a very rare masculine name. Also, 繁雄 is the last name as well as the forename.