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Last name Oysawat (Oysawat ) , across the world, is a very rare cognomen. The surname Oysawat is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Oysawat | Thailand |
Jirawan, Krongsak, Pitsamai, Kristiwan, Chamaiporn, and Watcharapong