Surname ตรงธรรม (ตรงธรรม 
, Be Fair) , worldwide, is a very rare cognomen. The cognomen ตรงธรรม is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, ตรงธรรม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ตรงธรรม | Thailand |