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Surname Ongthanawat (Ongthanawat ) , in the entire world, is a very rare last name. The cognomen Ongthanawat is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ongthanawat | Thailand |
Vinai, Arunrat, Duanjai, Vichian, and Phattheera