Where does “कस्य” come from?

कस्य (Sanskrit) comes from Proto-Indo-Iranian kás, from Proto-Indo-European kʷós — who.

Ancestry of “कस्य”, step by step

StepLanguageWordMeaning
1Proto-Indo-Iraniankáswho
2Proto-Indo-Europeankʷóswho

Words derived from “कस्य”

Every word from Proto-Indo-European kʷós →Every word from Proto-Indo-Iranian kás →
कस्य — Etymology, Origin & Word History | Etymology Explorer