Cognomen Phonethong (Phonethong 
) , in the entire world, is a very rare family name. The surname Phonethong is habitual in Northern America, particularly Canada, where it is an extremely rare surname, and the United States. More frequently, Phonethong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phonethong | Laos, United States, Canada |