Cognomen Siya-Siya (Siya-Siya 
) , throughout the world, is an extremely rare surname. Much more frequently, Siya-Siya is the forename as well as the last name. Parts of the name also exists independently as a first name Siya, and a first name Siya.
| VARIANT | COUNTRY |
|---|---|
| Siya-Siya | Philippines |