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