Last name Онанян (Онанян 
, Onanian 
) , all around the world, is a rare surname. The cognomen Онанян is characteristic of Russia, where it is a very rare surname, the United States, and France, where it is an extremely rare surname. Very seldom, Онанян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Онанян | Russia, Armenia |
| Onanian | United States, France |