Last name Siwaya (Siwaya 
) , around the globe, is a very rare family name. The last name Siwaya is habitual in Tanzania, where it is a very rare surname, and India, where it is an extremely rare surname. Much less frequently, Siwaya is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siwaya | South Africa, India, Thailand, Tanzania |