Where does “sober” come from?

sober (Middle English) comes from Old French sobre, from Latin sōbrius, from Latin sē-, from Latin sex, from Proto-Italic seks, from Proto-Indo-European swéḱs — six.

Ancestry of “sober”, step by step

StepLanguageWordMeaning
1Old Frenchsobre—
2Latinsōbriussober (not drunk)
3Latinsē-apart-; aside-; away
4Latinsexsix; 6
5Proto-Italicsekssix
6Proto-Indo-Europeanswéḱssix

Words derived from “sober”

Every word from Proto-Indo-European swéḱs →Every word from Latin sē- →Every word from Proto-Italic seks →