Cognomen ธำรงธรรม (Dharma 
, ธำรงธรรม, Thamrongtham 
) , in the entire world, is a common surname. The last name ธำรงธรรม is characteristic of Indonesia, where it is quite a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates. Not in comparison with a country's population, this name is the most popular in Indonesia, India, and Nepal. More frequently, ธำรงธรรม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dharma | Nepal, India, Indonesia, Sri Lanka, Saudi Arabia |
| Thamrongtham | Thailand |