Cognomen יארוסלב (Yaroslav 
, יארוסלב 
) , around the world, is a rare last name. The last name יארוסלב is characteristic of Israel, where it is quite a rare surname, Hungary, where it is a rare surname, and Slovakia. Not in comparison with a country's population, it is commonest in Israel, Spain, and China. More prevalently, יארוסלב is the forename as well as the last name.