Family name Sydavong (Sydavong 
) , throughout the world, is a rare cognomen. The last name Sydavong is habitual in Laos, where it is quite a rare surname, Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Sydavong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sydavong | Laos, Canada, China, France, United States |