Where does “Karna” come from?

Karna (English) comes from Sanskrit कर्ण, from Middle Hindi کرن.

Ancestry of “Karna”, step by step

Step	Language	Word	Meaning
1	Sanskrit	कर्ण	ear; the handle or ear of a vessel; the helm or...
2	Middle Hindi	کرن	—

Karna — Etymology, Origin & Word History | Etymology Explorer