Where does “प्रधान मंत्री” come from?

प्रधान मंत्री (Hindi) comes from English Prime Minister, from French premier ministre.

प्रधान मंत्री (Hindi): prime minister

Definitions

Step	Language	Word	Meaning
1	English	Prime Minister	Alternative letter-case form of prime minister
2	French	premier ministre	—

प्रधान मंत्री — Etymology, Origin & Word History | Etymology Explorer