Cognomen เพชรสุนทร (เพชรสุนทร 
) , across the world, is a very rare surname. The cognomen เพชรสุนทร is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, เพชรสุนทร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เพชรสุนทร | Thailand |
Pechsoonnaen, and Petchsuntat