Where does “Willert” come from?

Willert (English) comes from German Willert, from Old High German willo, from Proto-West Germanic willjō, from Proto-Germanic wiljô, from Proto-Indo-European welh₁- — to choose; to want.

Ancestry of “Willert”, step by step

Step	Language	Word	Meaning
1	German	Willert	—
2	Old High German	willo	will, wish, desire
3	Proto-West Germanic	willjō	will, wish, desire
4	Proto-Germanic	wiljô	will, wish, desire
5	Proto-Indo-European	welh₁-	to choose; to want

Every word from Proto-Indo-European welh₁- →Every word from Proto-Germanic wiljô →Every word from Proto-West Germanic willjō →