Cognomen Siwada (Siwada 
) , throughout the world, is a rare family name. The surname Siwada is characteristic of South Africa, where it is a rare surname, and India, where it is an extremely rare surname. Very seldom, Siwada is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siwada | India, South Africa, Thailand |