Where does “Achaea” come from?

Achaea (English) comes from Latin Achaea, from Ancient Greek Ἀχαΐα — Achaea.

Ancestry of “Achaea”, step by step

Step	Language	Word	Meaning
1	Latin	Achaea	—
2	Ancient Greek	Ἀχαΐα	Achaea

Achaea — Etymology, Origin & Word History | Etymology Explorer