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Family name Karnsak (Karnsak ) , around the world, is a very rare cognomen. The last name Karnsak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Karnsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Karnsak | Thailand |
Somjai, Siripun, Sarinporn, and Thawatchai