Cognomen Radyslav (Радислав 
, Radyslav 
) , all around the world, is a very rare family name. The surname Radyslav is characteristic of Kyrgyzstan, where it is a very rare surname, Russia, and Ukraine, where it is an extremely rare surname. Much more prevalently, Radyslav is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Радислав | Kazakhstan, Belarus, Georgia, Russia, Ukraine |
| Radyslav | Spain, Greece, United States, New Zealand, Ukraine |