Family name ทรงธรรมรัตนา (ทรงธรรมรัตนา 
) , in all the world, is an extremely rare surname. The cognomen ทรงธรรมรัตนา is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ทรงธรรมรัตนา | Thailand |