Cognomen ธำรง (Thamrong 
, Tumrong , Tharong 
) , in the world, is a very rare surname. The family name ธำรง is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Predominantly, ธำรง is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thamrong | United States, Malaysia, Indonesia, Thailand |
| Tumrong | Thailand |
| Tharong | United States, India, Thailand |
Dhamrong, Thandamrong, Thansumrong, Tharmrong, Thasumrong, Thomrong, Thumrong, and ธำมรงค์