Etymology
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Dietrich

German masc. name and surname, literally "folk-rule" (Dutch Diederik), from Old High German Theodric, from theuda "folk, people" (see Teutonic) + rihhi "rule," from Proto-Germanic *rikja "rule," from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule." Variants or familiar forms include Derrick, Dierks, Dieter, Dirk. Compare Theodoric. Theodric the Ostrogoth, who held sway in Italy 493-526, appears in later German tales as Dietrich von Bern (Verona).

updated on October 10, 2017

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Definitions of Dietrich from WordNet

Dietrich (n.)
French philosopher (born in Germany) famous as being one of the first self-described atheists in Europe;
Synonyms: Paul Heinrich Dietrich / Thiry / Paul-Henri Thiry / d'Holbach / baron d'Holbach
Dietrich (n.)
United States film actress (born in Germany) who made many films with Josef von Sternberg and later was a successful cabaret star (1901-1992);
Synonyms: Marlene Dietrich / Maria Magdalene von Losch
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.