Worldwide, 성기 (성기 
, Sung-Ki 
, Seonggi 
) is quite a rare masculine forename. The given name 성기 is characteristic of Eastern Asia, particularly South Korea, where it is quite a rare boy's name.
| VARIANT | COUNTRY |
|---|---|
| 성기 | South Korea |
| Sung-Ki | New Zealand, South Korea, United States |
| Seonggi | Canada, United States |
| Seong-Gi | United States |
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안성기 South Korean actor, KR (b. 1952) |
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| 권성기 South Korean politician, KR (b. 1908) |
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| 배성기 South Korean politician, KR (b. 1917) |
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| 홍성기 South Korean film director (1924-2001), KR (b. 1924) |
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| 임성기 South Korean entrepreneur, KR (b. 1940) |
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| 김성기 KR (b. 1935) |
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| 조성기 Korean writer, KR (b. 1951) |
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| 김성기 South Korean association football player, KR (b. 1961) |
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| 김성기 KR (b. 1956) |
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| 정성기 South Korean baseball player, KR (b. 1979) |
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| 김성기 South Korean comedian, KR (b. 1980) |
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| 김성기 North Korean association football player, KP (b. 1988) |
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