Where does “Μουρρήνας” come from?

Μουρρήνας (Ancient Greek) comes from Latin murēna, from Ancient Greek μύραινα — moray eel.

Ancestry of “Μουρρήνας”, step by step

Step	Language	Word	Meaning
1	Latin	murēna	—
2	Ancient Greek	μύραινα	moray eel

Μουρρήνας — Etymology, Origin & Word History | Etymology Explorer