Where does “Λάτιον” come from?

Λάτιον (Ancient Greek) comes from Latin Latium — {{w|Latium}}; the region around Rome.

Ancestry of “Λάτιον”, step by step

Step	Language	Word	Meaning
1	Latin	Latium	{{w\|Latium}}; the region around Rome

Λάτιον — Etymology, Origin & Word History | Etymology Explorer