Where does “защо” come from?

защо (Bulgarian) comes from Proto-Slavic čьto, from Proto-Balto-Slavic ki, from Proto-Indo-European kʷíd, from Proto-Indo-European kʷís, from Proto-Indo-European kʷi- — interrogative base.

защо (Bulgarian): why (for what reason)

Definitions

  1. why (for what reason)

Ancestry of “защо”, step by step

StepLanguageWordMeaning
1Proto-Slavicčьtowhat
2Proto-Balto-Slavickiwhat
3Proto-Indo-Europeankʷídneuter nominative/accusative singular of *kʷís
4Proto-Indo-Europeankʷíswho, what; who, which, that; which, what
5Proto-Indo-Europeankʷi-interrogative base

Words derived from “защо”

Every word from Proto-Indo-European kʷi- →Every word from Proto-Indo-European kʷís →Every word from Proto-Indo-European kʷíd →