Dieter did not appear on any lists of top boy names until 1932. That year, it not only premiered on Germany’s rankings, it was the 18th most popular boy name of the year. It would remain in the top 20 until 1957, peaking at #3 in 1940. After 1957, it never made the charts again.
Why?
Was there some (in)famous person who brought a negative connotation to the name? Was there a character in a novel or movie which made the name seem unsuitable? Did it simply fall out of fashion as quickly and dramatically as it had risen in popularity? I’d love to hear your thoughts.