Surname ปลั่งใจ (Plangjai 
, ปลั่งใจ, Plaengjai ) , worldwide, is a very rare family name. The cognomen ปลั่งใจ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ปลั่งใจ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Plangjai, Plaengjai | Thailand |