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 | Russia, Armenia, Kazakhstan, Ukraine |
| Kadjan | Israel, India, United States, Denmark, Indonesia |