Surname Orrain (Orrain 
) , worldwide, is a very rare last name. The last name Orrain is characteristic of Finland, where it is a rare surname, Thailand, where it is a very rare surname, and China, where it is an extremely rare surname. Also, Orrain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Orrain | Thailand, United States, China, Finland |