Last name วิบูลย์ศักดิ์ (วิบูลย์ศักดิ์ 
, Wiboonsak , Wibunsak ) , throughout the world, is a rare family name. The surname วิบูลย์ศักดิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. More prevalently, วิบูลย์ศักดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Wibunsak, Viboonsak, วิบูลย์ศักดิ์, Wiboonsak | Thailand |