Last name Rajarun (Rajarun 
) , globally, is a very rare family name. The cognomen Rajarun is habitual in Thailand, where it is a very rare surname, the United States, where it is an extremely rare surname, and India. More frequently, Rajarun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rajarun | United States, India, Thailand |