Where does “вьлчь” come from?

вьлчь (Old Church Slavonic) comes from Old Church Slavonic влькъ, from Proto-Slavic vьlkъ, from Proto-Balto-Slavic wilkás, from Proto-Indo-European wĺ̥kʷos — wolf.

Ancestry of “вьлчь”, step by step

StepLanguageWordMeaning
1Old Church Slavonicвлькъwolf
2Proto-Slavicvьlkъwolf
3Proto-Balto-Slavicwilkáswolf
4Proto-Indo-Europeanwĺ̥kʷoswolf
Every word from Proto-Indo-European wĺ̥kʷos →Every word from Proto-Balto-Slavic wilkás →Every word from Proto-Slavic vьlkъ →