Where does “jā” come from?

jā (Old High German) comes from Proto-West Germanic jā, from Proto-Germanic ja, from Proto-Indo-European yē — already.

Ancestry of “jā”, step by step

StepLanguageWordMeaning
1Proto-West Germanicjāyes; thus, so
2Proto-Germanicjayes; thus, so
3Proto-Indo-Europeanyēalready

Words derived from “jā”

Every word from Proto-Indo-European yē →Every word from Proto-Germanic ja →Every word from Proto-West Germanic jā →