Where does “cornuut” come from?

cornuut (Middle Dutch) comes from Old French cornut, from Latin Cornutus, from Latin cornū, from Proto-Indo-European ḱerh₂- — head, top; horn.

Ancestry of “cornuut”, step by step

Step	Language	Word	Meaning
1	Old French	cornut	—
2	Latin	Cornutus	—
3	Latin	cornū	—
4	Proto-Indo-European	ḱerh₂-	head, top; horn

cornuut — Etymology, Origin & Word History | Etymology Explorer