Where does “hwilch” come from?

hwilch (Middle English) comes from Old English hwelċ, from Proto-Germanic hwilīkaz, from Proto-Germanic hwaz, from Proto-Indo-European kʷos, from Proto-Indo-European kʷ- — The primary interrogative root.

Ancestry of “hwilch”, step by step

Step	Language	Word	Meaning
1	Old English	hwelċ	which
2	Proto-Germanic	hwilīkaz	what kind of, what sort of
3	Proto-Germanic	hwaz	who, what; whose; whom
4	Proto-Indo-European	kʷos	See *kʷis
5	Proto-Indo-European	kʷ-	The primary interrogative root

Every word from Proto-Indo-European kʷ- →Every word from Proto-Indo-European kʷos →Every word from Proto-Germanic hwaz →