Where does “helka” come from?

helka (Finnish) comes from Old Norse helgr, from Proto-Germanic hailagijō.

Ancestry of “helka”, step by step

StepLanguageWordMeaning
1Old Norsehelgrholiday, festival
2Proto-Germanichailagijō—
Every word from Proto-Germanic hailagijō →Every word from Old Norse helgr →
helka — Etymology, Origin & Word History | Etymology Explorer