Surname Vanthong (Vanthong 
) , in all the world, is a rare family name. The family name Vanthong is habitual in Laos, where it is quite a rare surname, Thailand, where it is a very rare surname, and Canada. Measured by absolute frequency, it most frequently occurs in Laos, Thailand, and the United States. More prevalently, Vanthong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vanthong | Canada, Vietnam, Thailand, Laos, United States |