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Worldwide, Shigeo (茂雄 , Shigeo , 繁雄 , among others...) is quite a rare gender-neutral first name. The first name Shigeo is characteristic of Japan, where it is quite a rare epicene name, China, where it is a rare masculine name, and the United States, where it is a very rare principally boy's, but scarcely girly name. Likewise, Shigeo is the last name as well as the forename.