Where does “Achilleus” come from?

Achilleus (Latin) comes from Ancient Greek Ᾰ̓χῐ́λλειος.

Ancestry of “Achilleus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Ᾰ̓χῐ́λλειος	—

Achilleus — Etymology, Origin & Word History | Etymology Explorer