Cognomen Phongsounthone (Phongsounthone 
) , in the entire world, is a rare last name. The cognomen Phongsounthone is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phongsounthone | Laos |
Somesanook, and Phetphailin