Last name Roulen (Roulen 
) , in the world, is an extremely rare surname. The cognomen Roulen is habitual in Greece, where it is a very rare surname, and India, where it is an extremely rare surname. More prevalently, Roulen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Roulen | South Africa, Malaysia, Philippines, India, Greece |