Cognomen 사 (士 
, 斯 , 师 , along with others...) , all around the world, is a prevalent last name. The family name 사 is characteristic of Eastern Asia, particularly China, where it is a common surname, and South Korea, where it is quite a rare surname. Much less frequently, 사 is the forename as well as the last name.
| VARIANT | COUNTRY |
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| 斯, 士, 舍, 謝, 師, 賜, 谢, 师, 仕, 赐, 衰 | China |
| 사 | South Korea |
Chay, Cheah, Chia, Ché, Ci, Cì, Dare, Dea, Dear, Der, Hsieh, Jair, Sa, She, Shea, Shei, Shi, Shieh, Shuai, Shè, Shì, Shī, Si, Sie, Siâ, Su, Sī, Sū, Tcha, Tchea, Tchia, Tjea, Tse, Tsia, Tạ, Xie, Xiè, Xà, Zia, Ši, Са, Ши, Шэ, שיה, هساي, サ, シー, 佘, 勰, 協, 史, 师氏, 氏, 璽, 社, 舎, 許, 谢氏, and 최
| 사방지 intersex people (b. 1500) |
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사미자 South Korean actress, KR (b. 1940) |
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| 사경욱 KR (b. 1905) |
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| 사광욱 KR (b. 1909) |
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사키루 South Korean illustrator, KR (b. 1980) |
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사 솔 South Korean sport climber, KR (b. 1994) |
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| 사성웅 South Korean voice actor, KR (b. 1974) |
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| 사현진 South Korean actress, KR (b. 1976) |
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| 사재혁 Olympic weightlifter, KR (b. 1985) |
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| 사공엽 South Korean baseball player, KR (b. 1992) |
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