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Family name Kumsak (Kumsak , คุ้มศักดิ์) , across the world, is an extremely rare cognomen. The last name Kumsak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Kumsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kumsak | Thailand |
Iwan, Saowaluk, Peerayut, Siraprapa, and Chanokchon