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Surname Sitthiasa (Sitthiasa ) , around the world, is a very rare family name. The cognomen Sitthiasa is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sitthiasa | Thailand |
Krit, Kesorn, Nittaya, Piamsiri, Nichapat, Ratchapon, Ratchapol, Ratchaphon, and Ratchaphol