Across the world, 성옥 (성옥 
, Seongok 
) is a rare unisex first name. The first name 성옥 is habitual in Eastern Asia, particularly South Korea, where it is quite a rare epicene name.
| VARIANT | COUNTRY |
|---|---|
| 성옥 | South Korea |
| Seongok | China, United States, South Korea |
|
정성옥 Olympic long-distance runner, KP (b. 1974) |
|
| 김성옥 South Korean film actor, KR (b. 1935) |
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| 조성옥 South Korean baseball player (1961-2009), KR (b. 1961) |
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| 오성옥 South Korean handball player, KR (b. 1972) |
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