Where does “let” come from?

let (Old Frisian) comes from Proto-Germanic lataz, from Proto-Indo-European lē(y)d-.

Ancestry of “let”, step by step

StepLanguageWordMeaning
1Proto-Germaniclatazslow, sluggish; lazy; late
2Proto-Indo-Europeanlē(y)d-—

Words derived from “let”

Every word from Proto-Indo-European lē(y)d- →Every word from Proto-Germanic lataz →
let — Etymology, Origin & Word History | Etymology Explorer