Family name Sounphachanh (Sounphachanh 
) , globally, is a rare cognomen. The surname Sounphachanh is habitual in South-eastern Asia, particularly Laos, where it is quite a common surname, and Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sounphachanh | Laos, Thailand, United States |