Where does “*sūberus” come from?
*sūberus (Vulgar Latin) comes from Latin sūber, from Old High German sūbar, from Proto-West Germanic sūbrī, from Latin sōbrius, from Latin sē-, from Latin sex, from Proto-Italic seks, from Proto-Indo-European swéḱs — six.
Ancestry of “*sūberus”, step by step