Cognomen Sounthonenavong (Sounthonenavong 
) , in all the world, is a rare surname. The surname Sounthonenavong is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sounthonenavong | Laos |
Phonetpheth, and Phonephet