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All around the world, Seong-Joo (성주 , Seong-Joo ) is quite a rare largely boy's, but infrequently feminine forename. The first name Seong-Joo is characteristic of Eastern Asia, particularly South Korea, where it is quite a rare dominantly male, but infrequently female name. Parts of the name also exists independently as a last name Seong, and a first name Joo.