Where does “Wallonian” come from?

Wallonian (English) comes from English Wallonia, from French Wallonie, from French Wallon, from Walloon walon, from Old High German ᚹᚨᛚᚺᚨ, from Proto-Germanic *walh, from Proto-Germanic walhaz, from Latin Volcae — wet, damp.

Ancestry of “Wallonian”, step by step

Wallonian traces back through two separate lines of ancestry.

via English Wallonia

StepLanguageWordMeaning
1EnglishWallonia3198 Wallonia, a stony asteroid and sizable Mars-crosser from the inner regions of the asteroid belt
2FrenchWallonie
3FrenchWallonperson from or living in Wallonia, Belgium
4WalloonwalonWalloon
5Old High Germanᚹᚨᛚᚺᚨforeigner, stranger, speaker of Celtic or Latin
6Proto-Germanic*walh
7Proto-Germanicwalhazforeigner, non-Germanic person
8LatinVolcaea Gallic tribal confederation; name of a Celtic...
9Proto-Celticwolkoshawk
10Proto-Indo-Europeanwelg-wet, damp

via English N

StepLanguageWordMeaning
1EnglishNThe ordinal number fourteenth, derived from this...
Every word from Proto-Indo-European welg-Every word from Proto-Celtic wolkosEvery word from Latin Volcae