This IS interesting, Sparteye (I loved that Sparta-kiss appellation, btw! ). "Jackie" peaked several decades before I was born and dipped sharply about a decade after I was born. The name "Elnora" both peaked and dropped sharply in the 1920's, which fits the ages of the two ladies I know who are named that. There is no listing for the way my parents spelled my actual first name.
And darn all you parents who named your '80's-born kids Joshua, Jason, or Jessica: I would have liked to have used those names but didn't want mine to be one of 14 or so per class.
Patty was a popular name around the time I was born, but neither of my kids knew hardly any; nor a single Billy that I can recall. Martha is even older, fitting my cousin of that name's age. Robert is still pretty popular, I see.