30%RatingSave Gender Masculine Usage Germanic [1] Meaning & HistoryExpand Links Old German form of Dieter. Related NamesFamily Tree·Details Rootsþeoda/diota + hari/heriOther Languages & CulturesDieter, Diether, Didi(German) Categories army, people, warrior, warriors Sources & References Förstemann, Ernst. Altdeutsches Namenbuch. Bonn, 1900, page 1433.