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Cognomen Saiyawat (Saiyawat ) , around the globe, is a rare last name. The family name Saiyawat is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Saiyawat | Thailand |
Napat, Khajon, Thawan, Penchun, Jintana, Nichapa, Jiradech, Kochchakorn, Rungrudee, Jittrakarn, and Kotchakorn