Where does “Igor” come from?

Igor (Polish) comes from Russian И́горь, from Old Norse Yngvarr, from Old Norse herr, from Proto-Norse ᚺᚨᚱᛃᚨ, from Proto-Germanic harjaz, from Proto-Indo-European kóryos, from Proto-Indo-European ḱer-, from Proto-Indo-European kr̥- — army.

Ancestry of “Igor”, step by step

StepLanguageWordMeaning
1RussianИ́горь
2Old NorseYngvarr
3Old Norseherrcrowd, great number; host; army, host, troops
4Proto-Norseᚺᚨᚱᛃᚨarmy leader; commander; warrior
5Proto-Germanicharjazarmy; army leader; commander; warrior
6Proto-Indo-Europeankóryoswar; troops; army; war, troops
7Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
8Proto-Indo-Europeankr̥-to turn, to bend
9Proto-Indo-Europeanker-army
Every word from Proto-Indo-European ker-Every word from Proto-Indo-European kr̥-Every word from Proto-Indo-European ḱer-