Where does “dutzen” come from?

dutzen (Middle High German) comes from Middle High German du, from Old High German dū, from Proto-West Germanic þū, from Proto-Germanic *þū, from Proto-Indo-European túh₂ — you, thou.

Ancestry of “dutzen”, step by step

StepLanguageWordMeaning
1Middle High Germanduyou thou, singular familiar
2Old High Germandūthou, you second-person singular pronoun
3Proto-West Germanicþūyou
4Proto-Germanic*þū—
5Proto-Indo-Europeantúh₂you, thou
Every word from Proto-Indo-European túh₂ →Every word from Proto-Germanic *þū →Every word from Proto-West Germanic þū →