Bubba, Junior, Dale, Billy Ed, Dwayne, John Boy, Rooster, Bobby, Earl, Carl. For women Sammy, Carla, Porsha, Krystal (specifically with a K), Deb or Debbie.

Having grown up white trash and being middle aged I can tell you that most of them go by some nickname or another and those that don't generally go by their first and middle name.