Conversation so far:
when was Hedy Lamarr born?
Lamarr was born Hedwig Eva Maria Kiesler in 1914.
who were the parents of Hedy Lamarr?
Lamarr was the only child of Gertrud Trude Kiesler and Emil Kiesler.

Question: how did her name shorten?
Self-contained rewrite: how did Hedy Lamarr's name shorten?