Family name 桓 (Huan 
, 桓 ) , all over the world, is a widespread cognomen. The cognomen 桓 is habitual in Malaysia, where it is a common surname, Singapore, where it is quite a rare surname, and China. Measured by absolute frequency, it most frequently occurs in Malaysia, China, and Vietnam. Likewise, 桓 is the forename as well as the last name.
| 桓温 Chinese general and Jin Dynasty regent (312–373), CN (b. 312) |
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| 桓玄 Chinese emperor, CN (b. 369) |
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| 桓階 Late 2nd/early 3rd century Chinese official, CN |
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| 桓範 Chinese Cao Wei official and general (died 249), CN |
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