Worldwide, 蔡云 (蔡云 
) is a rare epicene first name. The given name 蔡云 is habitual in Eastern Asia, particularly China, where it is a very rare unisex name. Much less frequently, 蔡云 is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| 蔡云 | China |