Family name Omjan (Omjan 
) , in the world, is a very rare cognomen. The cognomen Omjan is characteristic of Malaysia, where it is a very rare surname, Thailand, where it is an extremely rare surname, and China. More frequently, Omjan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Omjan | India, China, Malaysia, Thailand |