These are real
  1. Baltimore Ravens
    Edgar Allen Poe's "The Raven"
  2. San Francisco 49ers
    After Thomas Pynchon's "The Crying of Lot 49"
  3. Chicago Bears
    John Irving's "Setting Free the Bears"
  4. Philadelphia Eagles
    Tolkien's LOTR, which contains eagles
  5. Denver Broncos
    Cormac McCarthy's "All the Pretty Horses"
  6. Minnesota Vikings
    After Keith ("The Viking") Freer, from David Foster Wallace's "Infinite Jest"
  7. Cleveland Browns
    After the MFA program at Brown University, which is housed in Cleveland
  8. The Patriots
    After the movie "The Patriot" staring Mel Gibson