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