Cognomen Phoutthaxay (Phoutthaxay 
) , throughout the world, is an extremely rare surname. Much more frequently, Phoutthaxay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phoutthaxay | United States, Laos |
Souliya, Saynorath, Khounbolay, and Ladouangphan