Where does “бык” come from?

бык (Komi-Zyrian) comes from Russian бык, from Old East Slavic бꙑкъ, from Proto-Slavic bykъ — bull.

Ancestry of “бык”, step by step

StepLanguageWordMeaning
1Russianбыкbull, ox; a big, strong, or stubborn man;...
2Old East Slavicбꙑкъbull
3Proto-Slavicbykъbull
Every word from Proto-Slavic bykъ →Every word from Old East Slavic бꙑкъ →Every word from Russian бык →