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