Where does “zea” come from?

zea (Latin) comes from Ancient Greek ζειά, from Proto-Hellenic *dzeyyā́.

Ancestry of “zea”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ζειά	einkorn wheat, "Triticum monococcum", used as...
2	Proto-Hellenic	*dzeyyā́	—