Last name Агайан (Agajan 
, Agayan 
, Агайан 
) , in the world, is quite a rare cognomen. The cognomen Агайан is characteristic of Armenia, where it is quite a rare surname, Georgia, and Philippines, where it is a rare surname. Not in comparison with a country's population, it is commonest in Philippines, Armenia, and the United States. Also, Агайан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Agajan | Philippines, Turkmenistan, India, United States, Azerbaijan |
| Agayan | Philippines, India, Nigeria, United States, Russia |
| Агайан | Russia, Armenia |
| Agaian | Israel, United States, Georgia |