Surname Iadoian (Ядоян 
, Iadoian 
) , across the world, is a rare cognomen. The family name Iadoian is habitual in Georgia, where it is a rare surname, Russia, and Kazakhstan, where it is a very rare surname. Much less frequently, Iadoian is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ядоян | Ukraine, Armenia, Kazakhstan, Russia |
| Iadoian | Georgia |