Where does “मौर्य” come from?

मौर्य (Sanskrit) comes from Sanskrit मयूर, from Proto-Dravidian mayil- — peacock.

Ancestry of “मौर्य”, step by step

Step	Language	Word	Meaning
1	Sanskrit	मयूर	peacock
2	Proto-Dravidian	mayil-	peacock

मौर्य — Etymology, Origin & Word History | Etymology Explorer