Where does “wulk-” come from?

wulk- (Proto-Germanic) comes from Proto-Germanic walkaną, from Proto-Indo-European wolg-, from Proto-Indo-European wel- — to see.

Ancestry of “wulk-”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	walkaną	to turn, wind, roll, toss; to wend, walk, wander;...
2	Proto-Indo-European	wolg-	to twist; turn; move; to turn, twist; to move
3	Proto-Indo-European	wel-	to see

wulk- — Etymology, Origin & Word History | Etymology Explorer