Where does “seld” come from?

seld (Old English) comes from Old English setl, from Proto-Germanic setlaz, from Proto-Indo-European sḗd-.

Ancestry of “seld”, step by step

Step	Language	Word	Meaning
1	Old English	setl	sitting, residence; seat, bench, throne; setting
2	Proto-Germanic	setlaz	seat; chair; settle
3	Proto-Indo-European	sḗd-	—

seld — Etymology, Origin & Word History | Etymology Explorer