Where does “Rēgium” come from?

Rēgium (Latin) comes from Latin Rhegium, from Ancient Greek Ῥήγιον.

Ancestry of “Rēgium”, step by step

Step	Language	Word	Meaning
1	Latin	Rhegium	—
2	Ancient Greek	Ῥήγιον	—

Rēgium — Etymology, Origin & Word History | Etymology Explorer