Surname Allan-Vang-Sy (Allan-Vang-Sy 
) , around the globe, is an extremely rare family name. Much more frequently, Allan-Vang-Sy is the forename as well as the last name. Parts of the name also exists independently as a first name Allan, a last name Vang, and a last name Sy.
| VARIANT | COUNTRY |
|---|---|
| Allan-Vang-Sy | Democratic Republic of the Congo |