Surname Гадарян (Гадарян 
, Gadarian 
) , in all the world, is a very rare cognomen. The last name Гадарян is habitual in Switzerland, where it is a rare surname, Russia, where it is a very rare surname, and Israel. Measured by absolute frequency, this name is the most popular in the United States, Russia, and Switzerland. Much less frequently, Гадарян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Гадарян | Armenia, Russia |
| Gadarian | United States, Israel, Switzerland, Argentina |