Last name เพียรกุศล (เพียรกุศล 
) , in the entire world, is a very rare family name. The cognomen เพียรกุศล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, เพียรกุศล is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เพียรกุศล | Thailand |