Throughout the world, Aventajado-Sia (Aventajado-Sia 
) is an extremely rare unknown gender first name. Predominantly, Aventajado-Sia is the last name as well as the forename. Parts of the name also exists independently as a last name Aventajado, and a last name Sia.
| VARIANT | COUNTRY |
|---|---|
| Aventajado-Sia | Philippines |