Last name Soutthavong (Soutthavong 
) , worldwide, is a rare cognomen. The surname Soutthavong is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Soutthavong | Laos |
Nalone, Khanngeun, Malasavanh, and Kalavilay