Globally, 성구 (성구 
, Seonggu 
, Seong-Gu) is quite a rare boy's first name. The given name 성구 is characteristic of Eastern Asia, particularly South Korea, where it is quite a rare boy's name.
| VARIANT | COUNTRY |
|---|---|
| 성구 | South Korea |
| Seonggu | China, United Kingdom, South Korea, United States, Brazil |
|
이성구 KR (b. 1895) |
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| 이성구 KR (b. 1896) |
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| 이성구 KR (b. 1901) |
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| 이성구 KR (b. 1924) |
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| 강성구 South Korean announcer (1940-), KR (b. 1940) |
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| 이성구 KR (b. 1942) |
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| 한성구 South Korean baseball player (1988-), KR (b. 1988) |
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