Family name Kosakovskij (Kosakovskij 
, Косаковский 
) , in all the world, is a rare last name. The surname Kosakovskij is characteristic of Lithuania, where it is quite a rare surname, Belarus, where it is a rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Kosakovskij | Lithuania |
| Косаковский | Russia, Ukraine, Belarus |