Where does “pennkniv” come from?

pennkniv (Swedish) comes from Swedish kniv, from Old Swedish knīver, from Old Norse knífr, from Proto-Germanic knībaz, from Proto-Germanic knīpaną, from Proto-Indo-European ǵneybʰ-.

pennkniv (Swedish): a penknife, a small knife to fashion quills,...

Definitions

a penknife, a small knife to fashion quills,...

Ancestry of “pennkniv”, step by step

pennkniv traces back through two separate lines of ancestry.

via Swedish kniv

Step	Language	Word	Meaning
1	Swedish	kniv	knife
2	Old Swedish	knīver	knife
3	Old Norse	knífr	knife
4	Proto-Germanic	knībaz	pincers; shears; knife
5	Proto-Germanic	knīpaną	to pinch
6	Proto-Indo-European	ǵneybʰ-	—

via Swedish penna

Step	Language	Word	Meaning
1	Swedish	penna	a contour feather, a penna; a quill, a feather...
2	Latin	penna	wing; feather, especially a flight-feather;...
3	Proto-Italic	petnā	feather; wing
4	Proto-Indo-European	péth₂r̥	wing; feather
5	Proto-Indo-European	peth₂-	to spread out; to fly

Every word from Proto-Indo-European ǵneybʰ- →Every word from Proto-Germanic knīpaną →Every word from Proto-Germanic knībaz →