Surname Rudnickaia (Рудницкая 
, Rudnickaia 
) , all around the world, is quite a rare cognomen. The last name Rudnickaia is characteristic of Belarus, where it is quite a rare surname, Kazakhstan, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Рудницкая | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Rudnickaia | Georgia |
Рудницкаиа, and Рудницькая