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All around the world, Seong-Ju (성주 , Seong-Ju) is quite a rare dominantly masculine, but uncommonly girly forename. The first name Seong-Ju is habitual in Eastern Asia, particularly South Korea, where it is quite a rare mostly boy's, but infrequently female name. Parts of the name also exists independently as a last name Seong, and a last name Ju.