Where does “Senones” come from?

Senones (Latin) comes from Ancient Greek Σένονες, from Gaulish Senōnēs, from Proto-Celtic senos, from Proto-Indo-European sénos — old.

Ancestry of “Senones”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Σένονες	—
2	Gaulish	Senōnēs	—
3	Proto-Celtic	senos	old
4	Proto-Indo-European	sénos	old

Senones — Etymology, Origin & Word History | Etymology Explorer