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