Cognomen ธนวงค์ (ธนวงค์ 
, Thannavong 
) , all over the world, is a rare surname. The cognomen ธนวงค์ is characteristic of Laos, where it is quite a common surname, Thailand, where it is an extremely rare surname, and the United States. Very seldom, ธนวงค์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ธนวงค์ | Thailand |
| Thannavong | United States, Laos, Thailand |