Where does “पहिअ” come from?

पहिअ (Prakrit) comes from Sanskrit पथिक, from Sanskrit पथ, from Proto-Indo-Aryan patʰás, from Proto-Indo-Iranian patʰás, from Proto-Indo-European pent- — to pass; path.

Ancestry of “पहिअ”, step by step

Step	Language	Word	Meaning
1	Sanskrit	पथिक	traveller, wayfarer, wanderer
2	Sanskrit	पथ	way, road, path, course, route
3	Proto-Indo-Aryan	patʰás	—
4	Proto-Indo-Iranian	patʰás	—
5	Proto-Indo-European	pent-	to pass; path

Every word from Proto-Indo-European pent- →Every word from Proto-Indo-Iranian patʰás →Every word from Proto-Indo-Aryan patʰás →