Worldwide, Sounthonnavong (Sounthonnavong 
) is an extremely rare unknown gender forename. Much more prevalently, Sounthonnavong is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sounthonnavong | Laos |
Phonvilay, Phetdavanh, and Phonvilay Kat