Where does “पाकिस्तान” come from?

पाकिस्तान (Marathi) comes from Urdu پاکستان, from Classical Persian پَاک.

Ancestry of “पाकिस्तान”, step by step

Step	Language	Word	Meaning
1	Urdu	پاکستان	Land of the Pure
2	Classical Persian	پَاک	—

पाकिस्तान — Etymology, Origin & Word History | Etymology Explorer