Where does “ইন্দুৰ” come from?

ইন্দুৰ (Early Assamese) comes from Sanskrit उन्दुर, from Munda mun.

Ancestry of “ইন্দুৰ”, step by step

Step	Language	Word	Meaning
1	Sanskrit	उन्दुर	rat, mouse
2	Munda	mun	—

ইন্দুৰ — Etymology, Origin & Word History | Etymology Explorer