Family name เพียรพจน์ (เพียรพจน์ 
) , throughout the world, is a very rare surname. The surname เพียรพจน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, เพียรพจน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เพียรพจน์ | Thailand |