Where does “Egina” come from?

Egina (Portuguese) comes from Latin Aegīna, from Ancient Greek Αἴγινα — Aegina.

Ancestry of “Egina”, step by step

Step	Language	Word	Meaning
1	Latin	Aegīna	—
2	Ancient Greek	Αἴγινα	Aegina

Egina — Etymology, Origin & Word History | Etymology Explorer