Where does “Κλούσιον” come from?

Κλούσιον (Ancient Greek) comes from Latin Clūsium, from Etruscan 𐌂𐌋𐌄𐌅𐌔𐌉.

Ancestry of “Κλούσιον”, step by step

Step	Language	Word	Meaning
1	Latin	Clūsium	—
2	Etruscan	𐌂𐌋𐌄𐌅𐌔𐌉	—