Cognomen 오 (O 
, Oh , 오 
) , in the world, is a widespread family name. The family name 오 is habitual in South Korea, where it is a common surname, Singapore, and Venezuela (explore the name in all countries). Measured by absolute frequency, it is the most numerous in South Korea, China, and Indonesia. Likewise, 오 is the forename as well as the last name.
| 오사충 KR (b. 1327) |
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오영수 1909-1979 South Korean novelist, KR (b. 1914) |
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오진우 North Korean soldier and politician (1917-1995), KP (b. 1917) |
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| 오화영 South Korean politician (1880-1960), KR (b. 1880) |
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| 오숙근 wife of Kim Chwa-chin, KR (b. 1887) |
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| 오숭은 South Korean lawyer, KR (b. 1888) |
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| 오동진 Korean independence activist, KP (b. 1889) |
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오규원 Korean writer (1941-2007), KR (b. 1941) |
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오세영 South Korean poet and university professor, KR (b. 1942) |
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| 오상순 South Korean poet, KR (b. 1894) |
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| 오영선 KR (b. 1886) |
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오정희 South Korean writer, KR (b. 1947) |
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| 오필선 KR (b. 1887) |
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오 거돈 politician, KR (b. 1948) |
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| 오국영 KR (b. 1889) |
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