Where does “नीरा” come from?

नीरा (Marathi) comes from Sanskrit नीर, from Proto-Dravidian nīr — you; water.

Ancestry of “नीरा”, step by step

Step	Language	Word	Meaning
1	Sanskrit	नीर	water; juice, liquor; name of a teacher
2	Proto-Dravidian	nīr	you; water

नीरा — Etymology, Origin & Word History | Etymology Explorer