Where does “तेंदू” come from?

तेंदू (Hindi) comes from Sanskrit तिन्दुक — "Diospyros malabarica".

Ancestry of “तेंदू”, step by step

Step	Language	Word	Meaning
1	Sanskrit	तिन्दुक	"Diospyros malabarica"

तेंदू — Etymology, Origin & Word History | Etymology Explorer