Throughout the world, เธียรวรรณ (เธียรวรรณ 
) is a very rare epicene forename. The forename เธียรวรรณ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare epicene name. More prevalently, เธียรวรรณ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| เธียรวรรณ | Thailand |