Where does “exorciste” come from?

exorciste (Middle French) comes from Latin exorcista, from Ancient Greek ἐξορκιστής, from Ancient Greek ἐξορκίζω, from Ancient Greek ἐξ, from Ancient Greek Ὕπνος, from Proto-Hellenic húpnos, from Proto-Indo-European supnós, from Proto-Indo-European swóp-r̥ ~ swép-n̥s — to sleep.

Ancestry of “exorciste”, step by step

Step	Language	Word	Meaning
1	Latin	exorcista	exorcist
2	Ancient Greek	ἐξορκιστής	—
3	Ancient Greek	ἐξορκίζω	banish an evil spirit; bind by oath
4	Ancient Greek	ἐξ	Alternative form of ἐκ; out; from, out of
5	Ancient Greek	Ὕπνος	—
6	Proto-Hellenic	húpnos	—
7	Proto-Indo-European	supnós	sleep; death
8	Proto-Indo-European	swóp-r̥ ~ swép-n̥s	—
9	Proto-Indo-European	swep-	to sleep

Every word from Proto-Indo-European swep- →