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