Surname Phoutthavanh (Phoutthavanh 
) , in the world, is an extremely rare cognomen. Much more prevalently, Phoutthavanh is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phoutthavanh | Laos, Thailand, United States |
Phorsavath, Somsihakhom, Bounkham, Theppharaj, and Vongkhamchanh