Where does “سیستان” come from?

سیستان (Persian) comes from Persian سجستان, from Arabic سَجِسْتَان, from Pahlavi 𐭮𐭪𐭮𐭲𐭠𐭭, from Old Persian *Sakastānah.

Ancestry of “سیستان”, step by step

Step	Language	Word	Meaning
1	Persian	سجستان	—
2	Arabic	سَجِسْتَان	—
3	Pahlavi	𐭮𐭪𐭮𐭲𐭠𐭭	—
4	Old Persian	*Sakastānah	—