Cognomen Seo (Seo 
, 서 , เสวตร์ 
) , around the world, is a widespread family name. The last name Seo is characteristic of South Korea, where it is a common surname, U.S. Virgin Islands, where it is quite a common surname, and Cayman Islands. Measured by absolute frequency, this name is the most popular in South Korea, the United States, and Indonesia. Very seldom, Seo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Seo | South Korea, China, Indonesia, United States, Malaysia |
| 서 | South Korea |
| เสวตร์ | Thailand |
| Сео | Ukraine, Kyrgyzstan, Russia, Kazakhstan |
| yi seo (b. 1332) |
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| seo geo-jeong (b. 1420) |
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| seo gyeong-deok Korean philosopher (b. 1489) |
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| seo gyeong-u (b. 1573) |
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| seo sa-seon (b. 1579) |
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| seo mun-jung (b. 1634) |
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| seo magozaemon (b. 1650) |
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| seo jong-tae (b. 1652) |
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seo myeong-seon (b. 1728) |
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| seo myeong-gyun (b. 1680) |
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| seopyeong-gun lee yo (b. 1687) |
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| seo ji-su (b. 1714) |
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| seo mae-su (b. 1731) |
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| seo yeongsuhap Korean poet and mathematician of late modernity (b. 1753) |
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| seo ryong-bo (b. 1757) |
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