Where does “λέων” come from?

λέων (Ancient Greek) comes from Ancient Greek λέων — lion; Leo, the zodiacal sign; lionheart, savage.

Ancestry of “λέων”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	λέων	lion; Leo, the zodiacal sign; lionheart, savage

λέων — Etymology, Origin & Word History | Etymology Explorer