Surname Thepphavongsa (Thepphavongsa 
) , in the entire world, is a very rare last name. The surname Thepphavongsa is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname, and Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thepphavongsa | Laos, Thailand |
Dennis, and Soulinthone