Where does “Atena” come from?

Atena (Portuguese) comes from Latin athena, from Ancient Greek Ἀθηνᾶ — Athena.

Ancestry of “Atena”, step by step

Step	Language	Word	Meaning
1	Latin	athena	—
2	Ancient Greek	Ἀθηνᾶ	Athena

Atena — Etymology, Origin & Word History | Etymology Explorer