Cognomen 贞桓 (贞桓 
) , around the world, is a very rare surname. The last name 贞桓 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 贞桓 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 贞桓 | China |