Where does “feta” come from?

feta (Latin) comes from Latin fētus, from Proto-Indo-European dʰeh₁(y)- — to suckle, nurse.

Ancestry of “feta”, step by step

Step	Language	Word	Meaning
1	Latin	fētus	—
2	Proto-Indo-European	dʰeh₁(y)-	to suckle, nurse