Cognomen Chadnaya (Chadnaya 
, Чадная 
) , all over the world, is a rare family name. The surname Chadnaya is characteristic of Russia, where it is a very rare surname, Kazakhstan, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Chadnaya | Russia |
| Чадная | Kazakhstan, Russia, Ukraine |