Where does “Olga” come from?

Olga (English) comes 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
1Old East SlavicОльга—
2Old Norseheilagrholy; inviolable, sacred
3Proto-Germanichailagazholy, sacred
4Proto-Germanichailazwhole, unbroken, intact; entire, complete; hale,...
5Proto-Indo-European*kéh₂iloshealthy
Every word from Proto-Indo-European *kéh₂ilos →Every word from Proto-Germanic hailaz →Every word from Proto-Germanic hailagaz →