Where does “súla” come from?

súla (Old Norse) comes from Proto-Germanic sūliz, from Proto-Indo-European ḱsewl-, from Proto-Indo-European ḱsew-.

Ancestry of “súla”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	sūliz	beam, post; column, pillar
2	Proto-Indo-European	ḱsewl-	—
3	Proto-Indo-European	ḱsew-	—

súla — Etymology, Origin & Word History | Etymology Explorer