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Cognomen Khongphayak (Khongphayak ) , throughout the world, is a very rare last name. The family name Khongphayak is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khongphayak | Thailand |
Phayom, Pongsak, Thanakarn, Thanakrit, Thunkamon, Sahwangwan, and Phiriyaphong