Surname Святаслав (Святаслав 
) , around the globe, is an extremely rare family name. The last name Святаслав is habitual in Central Asia, particularly Kyrgyzstan, where it is a very rare surname. More frequently, Святаслав is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Святаслав | Kyrgyzstan, Ukraine, Russia |
Svetoslav, Sviataslau, Sviataslav, Sviatoslav, Svjatoslav, Svyatoslav, Swetoslaw, Swjatoslaw, Światosław, Светослав, Святаслаў, and Святослав