Family name เพชรเกลี้ยง (เพชรเกลี้ยง, Petkliang 
, Pechklieng ) , all around the world, is a rare cognomen. The family name เพชรเกลี้ยง is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phetkhliang, Petkliang, Pechklieng | Thailand |
Pechgleang, Pechklay, Pechkliang, Petchkleang, Petchkliang, Petchklieng, Phechkliang, Phechklieng, Phetkliang, and Phetklieng