Where does “ničьso” come from?

ničьso (Proto-Slavic) comes from Proto-Slavic ničeso, from Proto-Slavic ničьto, 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.

Ancestry of “ničьso”, step by step

StepLanguageWordMeaning
1Proto-Slavicničeso—
2Proto-Slavicničьtonothing
3Proto-Slavicčьtowhat
4Proto-Balto-Slavickiwhat
5Proto-Indo-Europeankʷídneuter nominative/accusative singular of *kʷís
6Proto-Indo-Europeankʷíswho, what; who, which, that; which, what
7Proto-Indo-Europeankʷi-interrogative base

Words derived from “ničьso”

Every word from Proto-Indo-European kʷi- →Every word from Proto-Indo-European kʷís →Every word from Proto-Indo-European kʷíd →
ničьso — Etymology, Origin & Word History | Etymology Explorer