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Family name Sihasak (Sihasak
) , in all the world, is an extremely rare surname. Much more prevalently, Sihasak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sihasak | India, Thailand |
Bunnag, Siharod, Prachum, Seeharod, and Phuangketkeow