Family name พจน์ธรรม (Dharma 
, พจน์ธรรม 
) , in all the world, is a common last name. The last name พจน์ธรรม 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, the name is most common in Indonesia, India, and Nepal. More prevalently, พจน์ธรรม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dharma | Indonesia, Sri Lanka, Nepal, India, Saudi Arabia |
| พจน์ธรรม | Thailand |