Surname Oustian (Устян 
, Устиан , Oustian 
) , around the world, is quite a rare cognomen. The cognomen Oustian is characteristic of Russia, where it is quite a rare surname, Armenia, where it is a rare surname, and Ukraine. Much less frequently, Oustian is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Устян | Kazakhstan, Armenia, Russia, Belarus, Ukraine |
| Устиан | Armenia, Russia |
| Oustian | Canada, United States |