Where does “Dodecaneso” come from?

Dodecaneso (Portuguese) comes from Latin Dodecanesus, from Ancient Greek Δωδεκάνησα, from Ancient Greek δώδεκα, from Proto-Indo-European *dwoΗdeḱm̥.

Ancestry of “Dodecaneso”, step by step

Step	Language	Word	Meaning
1	Latin	Dodecanesus	—
2	Ancient Greek	Δωδεκάνησα	twelve islands
3	Ancient Greek	δώδεκα	twelve
4	Proto-Indo-European	*dwoΗdeḱm̥	—

Dodecaneso — Etymology, Origin & Word History | Etymology Explorer