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Cognomen Wiboonjak (Wiboonjak ) , throughout the world, is a very rare family name. The cognomen Wiboonjak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Wiboonjak | Thailand |
Manwad, Rubtawan, Pitsanu, Chalermpol, and Phoomrapee