Where does “kag” come from?

kag (Middle English) comes from Old Norse kaggi, from Proto-Germanic kagô — pin, stick; bush, shrub, treestump.

Ancestry of “kag”, step by step

Step	Language	Word	Meaning
1	Old Norse	kaggi	keg, cask
2	Proto-Germanic	kagô	pin, stick; bush, shrub, treestump

kag — Etymology, Origin & Word History | Etymology Explorer