Surname เพียรกิจ (เพียรกิจ 
, Phiankit , Piankit ) , all over the world, is a rare cognomen. The cognomen เพียรกิจ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, เพียรกิจ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phiankit, Piankij, Piankit, เพียรกิจ | Thailand |