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Last name Siwasak (ศิวศักดิ์ , Siwasak
) , in the world, is an extremely rare surname. Much more frequently, Siwasak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ศิวศักดิ์ | Thailand |
| Siwasak | India, Thailand |
Pechkom, Jakbuntham, Jakbunthan, Juthong, Piamphisankun, Ratchawang, Charoensamutkul, and Thongpathomwong