Surname Southavilay (Southavilay 
) , all around the world, is quite a rare family name. The last name Southavilay is habitual in Laos, where it is quite a common surname, the United States, where it is an extremely rare surname, and Thailand.
| VARIANT | COUNTRY |
|---|---|
| Southavilay | United States, Canada, Laos, Thailand |