Cognomen ธรรมรัตนชัย (ธรรมรัตนชัย 
) , in the world, is an extremely rare last name. The last name ธรรมรัตนชัย is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธรรมรัตนชัย | Thailand |
ธรรมรงค์, and กิตติศักดิ์