Where does “бой” come from?

бой (Russian) comes from English boy, from Middle English boye, from Old English bōia, from Proto-Germanic bōjô, from Proto-Germanic bō-, from Proto-Indo-European bʰā- — to say.

бой (Russian): beating, breakage; battle, combat, engagement;...

Definitions

  1. beating, breakage; battle, combat, engagement;...

Ancestry of “бой”, step by step

бой traces back through two separate lines of ancestry.

via English boy

StepLanguageWordMeaning
1EnglishboyA young male; A male child: a son of any age; A...
2Middle Englishboyeservant, commoner, knave, boy
3Old Englishbōiaboy
4Proto-Germanicbōjôyounger brother, young male relation
5Proto-Germanicbō-A stem meaning "father, brother, close male...
6Proto-Indo-Europeanbʰā-to say

via Proto-Slavic bojь

StepLanguageWordMeaning
1Proto-Slavicbojьbattle, fight
2Proto-Indo-Europeanbʰoyh₂ós
3Proto-Indo-Europeanbʰeyh₂-to fear, be afraid; to strike, hit; to hew, cut

Words derived from “бой

Every word from Proto-Indo-European bʰā-Every word from Proto-Germanic bō-Every word from Proto-Germanic bōjô