I just learned that Yvonne De Carlo real name is Peggy Middleton.

Now you can see why she changed it to Yvonne DeCarlo.

Another strange fact about Yvonne DeCarlo. From the 1940's to The Munsters, she was Yvonne De Carlo. But a little after The Munsters, she closed the gap, and her last name became DeCarlo. I don't know why after 30 years she just didn't leave it alone.