Family name Vang-Sy (Vang-Sy 
) , in the entire world, is an extremely rare cognomen. Predominantly, Vang-Sy is the forename as well as the last name. Parts of the name also exists independently as a last name Vang, and a last name Sy.
| VARIANT | COUNTRY |
|---|---|
| Vang-Sy | Democratic Republic of the Congo |