Across the world, 재구 (재구 
, Jaegu 
, Jae-Gu) is quite a rare mostly boy's, but seldom female first name. The given name 재구 is habitual in Eastern Asia, particularly South Korea, where it is quite a rare mostly masculine, but seldom girly name.
| VARIANT | COUNTRY |
|---|---|
| 재구 | South Korea |
| Jaegu | China, South Korea, Thailand, United States, India |
| 전재구 South Korean politician, KR (b. 1928) |
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| 최재구 South Korean politician (1929-1998), KR (b. 1929) |
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| 안재구 Korean mathematician, KR (b. 1933) |
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| 김재구 South Korean Go player, KR (b. 1938) |
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| 강재구 KR (b. 1937) |
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| 곽재구 Korean writer, KR (b. 1954) |
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| 이재구 South Korean actor, KR (b. 1965) |
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| 조재구 KR (b. 1962) |
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| 여재구 KR (b. 1970) |
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