Surname Riaba (Riaba 
, Ряба 
) , all around the world, is quite a rare cognomen. The surname Riaba is characteristic of Ukraine, where it is quite a rare surname, Malaysia, where it is a rare surname, and Spain, where it is a very rare surname. Measured by absolute frequency, the name is most common in Ukraine, Malaysia, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Riaba | Malaysia, Spain, United States, Ukraine |
| Ряба | Russia, Kyrgyzstan, Ukraine |