Where does “Eleusi” come from?

Eleusi (Italian) comes from Latin Eleusis, from Ancient Greek Ἐλευσίς — Eleusis.

Ancestry of “Eleusi”, step by step

Step	Language	Word	Meaning
1	Latin	Eleusis	—
2	Ancient Greek	Ἐλευσίς	Eleusis

Eleusi — Etymology, Origin & Word History | Etymology Explorer