Cognomen Rostovcev (Ростовцев 
, Rostovcev 
) , in the entire world, is quite a rare surname. The surname Rostovcev is habitual in Russia, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Belarus. Measured by absolute frequency, it is commonest in Russia, Ukraine, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Ростовцев | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Rostovcev | Germany, Lithuania, Russia, Brazil |
Rostovtsev, and Rostowzew