Family name Tanthavong (Tanthavong 
) , in the world, is a rare cognomen. The surname Tanthavong is habitual in Laos, where it is quite a rare surname, Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tanthavong | Laos, Canada, United States |