Where does “करैत” come from?

करैत (Hindi) comes from Sanskrit काल, from Proto-Turkic kār, from Proto-Iranian karah.

Ancestry of “करैत”, step by step

Step	Language	Word	Meaning
1	Sanskrit	काल	black, dark blue; black, dark blue colour; pupil
2	Proto-Turkic	kār	snow
3	Proto-Iranian	karah	—

करैत — Etymology, Origin & Word History | Etymology Explorer