Where does “кобꙑлъка” come from?

кобꙑлъка (Old East Slavic) comes from Proto-Slavic *kobylъka, from Proto-Slavic kobyla — mare.

Ancestry of “кобꙑлъка”, step by step

StepLanguageWordMeaning
1Proto-Slavic*kobylъkafilly
2Proto-Slavickobylamare
Every word from Proto-Slavic kobyla →Every word from Proto-Slavic *kobylъka →