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Family name Onyungyuen (Onyungyuen ) , all over the world, is an extremely rare surname. The cognomen Onyungyuen is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Onyungyuen | Thailand |
Natthanun, Natthanunt, and Nutthanunt