Surname เพช (Phet 
, Phech 
, เพช ) , all over the world, is quite a rare cognomen. The cognomen เพช is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname, Myanmar, where it is a rare surname, and Thailand, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in South-eastern Asia, particularly Laos, Myanmar, and Indonesia. More frequently, เพช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phet | Laos, United States, Thailand, India, Myanmar |
| Phech | Cambodia, United States, France, Thailand, India |
| เพช | Thailand |
| Phesh | South Africa, India, Thailand |
โคตจันทร์, ศรีรังศิลป์, and พงษ์ศรี