Family name Sidelkovskaya (Sidelkovskaya 
, Сидельковская 
) , in all the world, is a rare last name. The surname Sidelkovskaya is habitual in Russia, where it is a very rare surname, Kazakhstan, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sidelkovskaya | Russia, United Kingdom |
| Сидельковская | Kazakhstan, Russia |