Where does “sicher” come from?

sicher (Middle High German) comes from Old High German sichur, from Proto-West Germanic sikur, from Latin sēcūrus, from Latin sē-, from Latin sex, from Proto-Italic seks, from Proto-Indo-European swéḱs — six.

Ancestry of “sicher”, step by step

StepLanguageWordMeaning
1Old High GermansichurAlternative spelling of sihhur
2Proto-West Germanicsikursecure, safe; sure, certain
3Latinsēcūruscareless, negligent
4Latinsē-apart-; aside-; away
5Latinsexsix; 6
6Proto-Italicsekssix
7Proto-Indo-Europeanswéḱssix

Words derived from “sicher”

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