Surname Омельян (Омельян 
, Omelyan 
) , across the world, is a rare family name. The cognomen Омельян is habitual in Ukraine, where it is quite a rare surname, Kazakhstan, where it is a very rare surname, and Belarus. Measured by absolute frequency, it is commonest in Ukraine, Russia, and Kazakhstan. Also, Омельян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Омельян | Ukraine, Belarus, Kazakhstan, Russia |
| Omelyan | Ukraine, Spain, Russia, Italy, United States |