Where does “Ilion” come from?

Ilion (Italian) comes from Ancient Greek Ἴ̄λιον, from Hittite ??? — Wilusa; {{w|Wilusa}}.

Ancestry of “Ilion”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Ἴ̄λιον	Ilium, Troy
2	Hittite	???	Wilusa; {{w\|Wilusa}}