Where does “stickpin” come from?

stickpin (English) comes from English PIN, from Middle English pinne, from Old English pinn, from Proto-Germanic pinnaz, from Proto-Indo-European bend- — point, pin; peg, tip, protruding point, edge;...

stickpin (English): An ornamented pin used to secure a necktie's end...

Definitions

An ornamented pin used to secure a necktie's end...

Ancestry of “stickpin”, step by step

stickpin traces back through two separate lines of ancestry.

via English PIN

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

via English stick

Step	Language	Word	Meaning
1	English	stick	An elongated piece of wood or similar material,...
2	Middle English	stikke	twig, branch; kindling, twigs used as a...
3	Old English	sticca	stick
4	Proto-West Germanic	*stikkō	stick, pole

Every word from Proto-Indo-European bend- →Every word from Proto-Germanic pinnaz →Every word from Old English pinn →