Cognomen Яраслаў (Ярослав 
, Jaroslav 
, Jarosław 
, along with others...) , in the world, is quite a common family name. The last name Яраслаў is habitual in Eastern Europe, particularly Czechia, where it is quite a common surname, Slovakia, and Moldova, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Russia, Czechia, and Poland. Predominantly, Яраслаў is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ярослав | Kazakhstan, Belarus, Russia, Ukraine, Poland |
| Jaroslav | Slovakia, Russia, Czechia, Germany, Poland |
| Jarosław | Slovakia, United States, Czechia, Germany, Poland |
| Yaroslav | Uzbekistan, Slovakia, Russia, Czechia, Poland |
| Iaroslav | Russia, United States, Germany, Poland, Spain |
| Yaraslau | Belarus, Chile, United States |
| Yaraslav | Belarus, United States, Angola |
| Яраслаў | Belarus |
| Jaroszlav | United Kingdom, Hungary |
| Jaraslaw, Jaraslau | United States |