Where does “welisk” come from?

welisk (Old High German) comes from Proto-Germanic walhiskaz, from Proto-Germanic walhaz, from Latin Volcae, from Proto-Celtic wolkos, from Proto-Indo-European welg- — wet, damp.

Ancestry of “welisk”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	walhiskaz	foreign, non-Germanic
2	Proto-Germanic	walhaz	foreigner, non-Germanic person
3	Latin	Volcae	a Gallic tribal confederation; name of a Celtic...
4	Proto-Celtic	wolkos	hawk
5	Proto-Indo-European	welg-	wet, damp

Every word from Proto-Indo-European welg- →Every word from Proto-Celtic wolkos →Every word from Latin Volcae →