Where does “باكستان” come from?

باكستان (Arabic) comes from Urdu پاکستان, from Classical Persian پَاک.

Ancestry of “باكستان”, step by step

StepLanguageWordMeaning
1UrduپاکستانLand of the Pure
2Classical Persianپَاک—
Every word from Classical Persian پَاک →Every word from Urdu پاکستان →