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Dictionary of Medieval Names
from European Sources

Jaroslav m. Slavic Jarilo, the name of a god of vegetation, fertility, and springtime, or Slavic jar, yar 'strong, fierce' + Slavic sława, slava 'glory, fame'.

Czech Republic
Latin
1348 Jaroslaus (nom) chlumecky 8; 1349 Jaroslao (dat) ibid. 114, Jaroslaus (nom) ibid. 26; 1350 Jaroslao (dat) ibid. 168, Jaroslaus (nom) ibid. 175; 1351 Jaroslaus (nom) ibid. 35; 1353 Jaroslao (abl) ibid. 60, Jaroslaus (nom) ibid. 82; 1355 Jaroslaus (nom) ibid. 65; 1356 Jaroslaus (nom) ibid. 178, p. 29
1353 Jaros (nom) chlumecky 49, p. 23
Cite as: S.L. Uckelman. "Jaroslav". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Jaroslav.