All over the world, เพียรกิจ (เพียรกิจ 
, Phiankit , Piankit ) is a very rare epicene forename. The first name เพียรกิจ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare epicene name. More prevalently, เพียรกิจ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Phiankit, Piankij, Piankit, เพียรกิจ | Thailand |