Last name วจนกิจไพบูลย์ (วจนกิจไพบูลย์ 
) , throughout the world, is a very rare cognomen. The last name วจนกิจไพบูลย์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| วจนกิจไพบูลย์ | Thailand |