Where does “seis” come from?

seis (Portuguese) comes from Old Portuguese seis, from Latin sex, from Proto-Italic seks, from Proto-Indo-European swéḱs — six.

seis (Portuguese): six

Definitions

  1. six

Ancestry of “seis”, step by step

StepLanguageWordMeaning
1Old Portugueseseis—
2Latinsexsix; 6
3Proto-Italicsekssix
4Proto-Indo-Europeanswéḱssix

Words derived from “seis”

Every word from Proto-Indo-European swéḱs →Every word from Proto-Italic seks →Every word from Latin sex →
seis — Etymology, Origin & Word History | Etymology Explorer