Where does “cara” come from?

cara (Old Portuguese) comes from Vulgar Latin cara, from Ancient Greek κάρα, from Proto-Hellenic *kárahə.

Ancestry of “cara”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	cara	face
2	Ancient Greek	κάρα	head, face; the head or top of anything, as of a...
3	Proto-Hellenic	*kárahə	—

cara — Etymology, Origin & Word History | Etymology Explorer