Cognomen Sinkovskaia (Sinkovskaia 
, Синковская 
, Синьковская 
) , all around the world, is a rare last name. The last name Sinkovskaia is habitual in Russia, where it is a rare surname, Kazakhstan, and Belarus.
| VARIANT | COUNTRY |
|---|---|
| Sinkovskaia | Russia, Spain |
| Синковская | Russia, Kazakhstan, Kyrgyzstan |
| Синьковская | Kazakhstan, Belarus, Kyrgyzstan, Russia, Ukraine |