Where does “sporðr” come from?

sporðr (Old Norse) comes from Proto-Indo-European (s)prend- — to spin, to swift; to sprint.

Ancestry of “sporðr”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	(s)prend-	to spin, to swift; to sprint

sporðr — Etymology, Origin & Word History | Etymology Explorer