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