Where does “hwīlum” come from?

hwīlum (Old English) comes from Proto-Germanic hwīlō, from Proto-Indo-European kʷyeh₁- — to rest; rest, peace.

Ancestry of “hwīlum”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	hwīlō	time, period of time, while; period of rest,...
2	Proto-Indo-European	kʷyeh₁-	to rest; rest, peace

hwīlum — Etymology, Origin & Word History | Etymology Explorer