Where does “pin” come from?

Pin comes from Old English pinn, from Proto-Germanic pinnaz, from Proto-Indo-European *bend-, meaning to bend or curve.

pin (English): A needle without an eye made of drawn-out steel...

Definitions

Step	Language	Word	Meaning
1	Middle English	pinne	—
2	Old English	pinn	pin; peg; an instrument of writing; pen
3	Proto-Germanic	pinnaz	pin
4	Proto-Indo-European	bend-	point, pin; peg, tip, protruding point, edge;...

pin — Etymology, Origin & Word History | Etymology Explorer