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Cognomen Khongthai (คงไทย , Khongthai
) , all over the world, is quite a rare last name. The family name Khongthai is habitual in Thailand, where it is quite a rare surname, and India, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| คงไทย | Thailand |
| Khongthai | India, Thailand |