Last name นิรุณ (Nirun 
, นิรุณ , Niroon 
) , around the world, is a rare family name. The cognomen นิรุณ is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Thailand, and Indonesia, where it is a very rare surname. More prevalently, นิรุณ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nirun | Malaysia, Thailand, India, Sri Lanka, Indonesia |
| นิรุณ | Thailand |
| Niroon | United States, India, Thailand |
มูลสุรินทร์, จุลลาบุดดี, รัตนไพบูลย์, พัฒนกิจวิบูลย์, and เจียมวัฒนาเลิศ