Family name Tarnavskiy (Тарнавский 
, Tarnavskiy 
) , in the entire world, is a rare cognomen. The surname Tarnavskiy is habitual in Belarus, where it is a rare surname, Russia, and Lithuania. In absolute terms, it is the most numerous in Russia, Belarus, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Тарнавский | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Tarnavskiy | Ukraine, Lithuania, United States, Russia |