welhisch (Middle High German) comes from Old High German walahisc, from Proto-Germanic *walhisk, from Proto-Germanic walhiskaz, from Proto-Germanic walhaz, from Latin Volcae, from Proto-Celtic wolkos, from Proto-Indo-European welg- — wet, damp.
Ancestry of “welhisch”, step by step
welhisch traces back through 3 separate lines of ancestry.