Family name Seangsavang (Seangsavang 
) , in the entire world, is a very rare surname. The surname Seangsavang is habitual in South-eastern Asia, particularly Laos, where it is a rare surname, and Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Seangsavang | Thailand, Laos |
Soomphone, and Thawathchai