Where does “corðyn” come from?

corðyn (Middle Welsh) comes from Latin cardō, from Latin carduus, from Proto-Indo-European ḱers- — to run.

Ancestry of “corðyn”, step by step

Step	Language	Word	Meaning
1	Latin	cardō	hinge (of a door or gate), usually a pivot and socket in Roman times
2	Latin	carduus	a wild thistle; the artichoke
3	Proto-Indo-European	ḱers-	to run