Where does “gestern” come from?
gestern (German) comes from Old High German gesteron, from Proto-Germanic gestra-, from Proto-Indo-European dʰǵʰyésteros, from Proto-Indo-European dʰǵʰyes-, from Proto-Indo-European dʰeǵʰ- — day.
gestern (German): yesterday
Ancestry of “gestern”, step by step