Jaroslav (also written as Yaroslav or Jarosław in other Slavic languages) is a Czech and Slovak first name, pagan in origin. Its feminine form is Jaroslava. . There are several possible origins of the name Jaroslav. It is very likely that originally the two elements of the name referred to Jarilo - male Proto-Slavic deity of the sun, spring, and fertility, and slav meaning glory, i.e. "glory of the sun". https://en.wikipedia.org/wiki/Jaroslav