Family name Souvanxay (Souvanxay 
) , around the world, is an extremely rare cognomen. Much more prevalently, Souvanxay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Souvanxay | Laos, United States |
Khamla, Xongmany, Lakmaitree, Phetchanpheng, Souksavath, and Thonesavane