Last name Kadjan (Кадян 
, Kadjan 
) , all around the world, is a rare cognomen. The family name Kadjan is characteristic of Ukraine, where it is a very rare surname, Russia, and Indonesia. Much less frequently, Kadjan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Кадян | Kazakhstan, Armenia, Russia, Ukraine |
| Kadjan | Indonesia, United States, India, Denmark, Israel |