Surname Siyaca (Siyaca 
) , around the globe, is a very rare last name. The family name Siyaca is habitual in South Africa, where it is a rare surname, and India, where it is an extremely rare surname. Very seldom, Siyaca is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siyaca | India, South Africa |