Where does “Ariogaisos” come from?

Ariogaisos (Gaulish) comes from Gaulish gaisos, from Proto-Celtic gaisos, from Proto-Indo-European ǵʰays-, from Proto-Indo-European ǵʰey- — winter.

Ancestry of “Ariogaisos”, step by step

Ariogaisos traces back through two separate lines of ancestry.

via Gaulish gaisos

StepLanguageWordMeaning
1Gaulishgaisos—
2Proto-Celticgaisosspear
3Proto-Indo-Europeanǵʰays-pointed stick, spear; spear
4Proto-Indo-Europeanǵʰey-winter

via Gaulish arios

StepLanguageWordMeaning
1Gaulishariosfreeman; lord
2Proto-Celticaryosfreeman, noble
3Proto-Indo-Europeanh₂éry-o-shost
Every word from Proto-Indo-European ǵʰey- →Every word from Proto-Indo-European ǵʰays- →Every word from Proto-Celtic gaisos →