Where does “hælog” come from?

hælog (Old Swedish) comes from Old Norse heilagr, from Proto-Germanic hailagaz, from Proto-Germanic hailaz, from Proto-Indo-European *kéh₂ilos — healthy.

Ancestry of “hælog”, step by step

StepLanguageWordMeaning
1Old Norseheilagrholy; inviolable, sacred
2Proto-Germanichailagazholy, sacred
3Proto-Germanichailazwhole, unbroken, intact; entire, complete; hale,...
4Proto-Indo-European*kéh₂iloshealthy
Every word from Proto-Indo-European *kéh₂ilos →Every word from Proto-Germanic hailaz →Every word from Proto-Germanic hailagaz →