People living the Fancy Belt have had unusual names for years. Mencken's books on American English describe this.
I don't know about any "fancy belt" but if you do any genealogical research you come to the same conclusion.
Names went really wild after the Civil War. I can only imagine some conversations between mother and pregnant daughter went similar to this:
"What kind of name is "Effie?" That's fine for a little girl, but can you imagine a grown woman being called "Effie?" What's wrong with names like Susannah and Mary, Catherine and Anne? You can call her "Effie" if you want, but at least give her a real name!"
and
"Gladys? That's a GIRL'S name? You must be joking!"