Cognomen เพชรศร (เพชรศร 
, Petchsorn 
, Phetsorn 
) , in all the world, is a rare last name. The surname เพชรศร is habitual in Thailand, where it is a rare surname, and New Zealand, where it is a very rare surname. Very seldom, เพชรศร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phetaksorn, เพชรศร | Thailand |
| Petchsorn | Venezuela, Thailand, United States |
| Phetsorn | New Zealand, Thailand |