Surname Riabtcov (Рябцов 
, Riabtcov 
) , in all the world, is a rare cognomen. The family name Riabtcov is characteristic of Eastern Europe, particularly Russia, where it is a rare surname, Ukraine, and Belarus. Measured by absolute frequency, it is the most numerous in Russia, Ukraine, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Рябцов | Ukraine, Belarus, Kazakhstan, Russia |
| Riabtcov | Estonia |