Where does “senight” come from?

senight (Middle English) comes from Old English seofeniht, from Old English seofon, from Proto-West Germanic sebun, from Proto-Germanic sebun, from Proto-Germanic sebunt, from Proto-Indo-European septḿ̥ — seven.

Ancestry of “senight”, step by step

StepLanguageWordMeaning
1Old Englishseofenihta week
2Old Englishseofonseven
3Proto-West Germanicsebunseven
4Proto-Germanicsebunseven
5Proto-Germanicsebunt—
6Proto-Indo-Europeanseptḿ̥seven

Words derived from “senight”

Every word from Proto-Indo-European septḿ̥ →Every word from Proto-Germanic sebunt →Every word from Proto-Germanic sebun →