Where does “Афганиста́н” come from?

Афганиста́н (Russian) comes from Classical Persian اَفْغَانِسْتَان.

Ancestry of “Афганиста́н”, step by step

Step	Language	Word	Meaning
1	Classical Persian	اَفْغَانِسْتَان	—

Афганиста́н — Etymology, Origin & Word History | Etymology Explorer