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