The story
- Classical Persian · derived fromهِنْدُوسْتَان“Indian subcontinent”
- Hindustani · borrowed from
- English todayHindustan
Borrowed from Hindustani ہِنْدُوسْتان (hindūstān) / हिंदुस्तान (hindustān), itself from Classical Persian هِنْدُوسْتَان (hindūstān, “Indian subcontinent”). By surface analysis, Hindu + -stan.
Etymology from Wiktionary, CC BY-SA 4.0.