Where does “jasion” come from?

jasion (Polish) comes from Proto-Slavic àsenь, from Proto-Indo-European Heh₃s- — ash tree.

Ancestry of “jasion”, step by step

StepLanguageWordMeaning
1Proto-Slavicàsenьash tree
2Proto-Indo-EuropeanHeh₃s-ash tree
Every word from Proto-Indo-European Heh₃s- →Every word from Proto-Slavic àsenь →