Where does “ম'ৰা” come from?

ম'ৰা (Assamese) comes from Old Assamese মৈৰা.

Ancestry of “ম'ৰা”, step by step

Step	Language	Word	Meaning
1	Old Assamese	মৈৰা	—

ম'ৰা — Etymology, Origin & Word History | Etymology Explorer