Surname ธรรมราช (ธรรมราช 
, Thamaraj 
, Thummaraj ) , all over the world, is quite a rare cognomen. The surname ธรรมราช is habitual in Thailand, where it is quite a rare surname, Malaysia, where it is an extremely rare surname, and India. Very seldom, ธรรมราช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tummaraj, ธรรมราช | Thailand |
| Thamaraj | India, Malaysia, Thailand, United States |
| Thummaraj | India, Thailand |
Dhammaraj, Dharmarajan, Dharmmaraj, Thamkronart, Thammacharat, Thammachrat, Thammara, Thammarach, Thammaraj, Thammarart, Thammarat, Thamnarat, Tharmarat, Tharmmarat, Thrammarat, and Thumarach