All over the world, ธารธรรม (Thantham 
, ธารธรรม , Thantam ) is a very rare epicene forename. The forename ธารธรรม is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare epicene name. Also, ธารธรรม is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Thantham | India, Myanmar, Thailand, United States |
| Thanthum, ธารธรรม | Thailand |
| Thantam | India, United States, Thailand |
Tarnthum, Tharntharm, and Tharnthum
ยีสาร, ศิลารักษ์, and พรหมพระจันทร์