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Cognomen Khongkhayen (Khongkhayen ) , worldwide, is a very rare last name. The cognomen Khongkhayen is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khongkhayen | Thailand |
Yuttasak, Yutthasak, and Preeyaporn