Cognomen Phetphayvanh (Phetphayvanh 
) , in the entire world, is a rare family name. The surname Phetphayvanh is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname. Also, Phetphayvanh is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phetphayvanh | Laos, United States |