Where does “सफ़ा” come from?

सफ़ा (Hindi) comes from Arabic صَفَا, from Arabic صَفَاء.

Ancestry of “सफ़ा”, step by step

Step	Language	Word	Meaning
1	Arabic	صَفَا	to become pure, to remain after a process of...
2	Arabic	صَفَاء	—