Where does “कोयला” come from?

कोयला (Hindi) comes from Prakrit 𑀓𑁄𑀇𑀮𑀸, from Sanskrit कोकिल — a cuckoo.

कोयला (Hindi): coal ; charcoal

Definitions

Step	Language	Word	Meaning
1	Prakrit	𑀓𑁄𑀇𑀮𑀸	—
2	Sanskrit	कोकिल	a cuckoo

कोयला — Etymology, Origin & Word History | Etymology Explorer