Last name ธำรงวัฒนา (ธำรงวัฒนา, Thumrongwatana 
) , all over the world, is an extremely rare surname. The last name ธำรงวัฒนา is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thumrongwatana | Thailand |