Where does “Olga” come from?

Olga (Estonian) comes from Russian О́льга, from Old East Slavic Ольга, from Old Norse heilagr, from Proto-Germanic hailagaz, from Proto-Germanic hailaz, from Proto-Indo-European *kéh₂ilos — healthy.

Ancestry of “Olga”, step by step

StepLanguageWordMeaning
1RussianО́льгаOscar (O in the ICAO spelling alphabet)
2Old East SlavicОльга—
3Old Norseheilagrholy; inviolable, sacred
4Proto-Germanichailagazholy, sacred
5Proto-Germanichailazwhole, unbroken, intact; entire, complete; hale,...
6Proto-Indo-European*kéh₂iloshealthy
Every word from Proto-Indo-European *kéh₂ilos →Every word from Proto-Germanic hailaz →Every word from Proto-Germanic hailagaz →