Family name Sidorskaya (Сидорская 
, Sidorskaya 
) , all over the world, is a rare last name. The cognomen Sidorskaya is habitual in Belarus, where it is a rare surname, Kazakhstan, and Russia. Much less frequently, Sidorskaya is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Сидорская | Kazakhstan, Russia, Ukraine, Belarus |
| Sidorskaya | Germany, Russia |