Where does “kene” come from?

kene (Middle English) comes from Old English cēne, from Proto-Germanic kōniz, from Proto-Indo-European ǵneh₃- — to know.

kene (Middle English): keen

Definitions

Step	Language	Word	Meaning
1	Old English	cēne	keen, fierce, bold, brave, warlike, powerful;...
2	Proto-Germanic	kōniz	able, knowledgeable, skillful, clever
3	Proto-Indo-European	ǵneh₃-	to know

kene — Etymology, Origin & Word History | Etymology Explorer