Cognomen Simmalaivong (Simmalaivong 
) , all over the world, is a rare last name. The last name Simmalaivong is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname, and Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Simmalaivong | Laos, Thailand |