Family name 贞虹 (贞虹 
) , in all the world, is a very rare cognomen. The family name 贞虹 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 贞虹 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 贞虹 | China |