Where does “افغانستان” come from?

افغانستان (Pashto) comes from Classical Persian اَفْغَانِسْتَان.

Ancestry of “افغانستان”, step by step

Step	Language	Word	Meaning
1	Classical Persian	اَفْغَانِسْتَان	—

افغانستان — Etymology, Origin & Word History | Etymology Explorer