Dietrich

German: from the Germanic personal name Tederich (Theudoricus), composed of the elements theud ‘people’, ‘race’ + rīc ‘power(ful)’, ‘rich’. This surname is common throughout central and eastern Europe, particularly in the western Slavic countries. The forename occurs in a wide variety of local forms, especially in northern Germany. It is cognate with Dutch Diederik (see Dederick).