Where does “vъ(n)-” come from?

vъ(n)- (Proto-Slavic) comes from Proto-Indo-European h₁én — in.

Ancestry of “vъ(n)-”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeanh₁énin

Words derived from “vъ(n)-

Every word from Proto-Indo-European h₁én