Where does “کجا” come from?

کجا (Persian) comes from Persian که, from Proto-Indo-European kʷís, from Proto-Indo-European kʷi- — interrogative base.

کجا (Persian): where

Definitions

Step	Language	Word	Meaning
1	Persian	که	API •; that; which
2	Proto-Indo-European	kʷís	who, what; who, which, that; which, what
3	Proto-Indo-European	kʷi-	interrogative base

کجا — Etymology, Origin & Word History | Etymology Explorer