Cognomen Thavanh (Thavanh 
) , around the world, is a rare last name. The family name Thavanh is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname. Very seldom, Thavanh is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thavanh | United States, Laos |