ANSWERS: 2
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It is considered a blooper. Ethel’s middle name is Louise but in "The Million-Dollar Idea," Ethel’s middle name changed to Roberta, then in "Ethel’s Home Town," it became Mae.
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Now I have always read that her full name was simply Ethel Louise Roberta Mae Potter Mertz. I never knew it to be a blooper. In books, that is her given name and Fred is known as Fredrick Hobart Mertz.
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