1. John Connor (Terminator)
  2. John Carpenter (The Day The Earth Stood Still)
  3. James Cole (Twelve Monkeys)
  4. John Coffey (The Green Mile)
  5. Jim Casey (The Grapes of Wrath)
  6. John Carter (John Carter)
  7. Jace (Mortal Instruments)
  8. Johnny Cade (The Outsiders)
  9. Jayne Cobb (Firefly)
  10. John Constantine (Constantine)
  11. John McClane (Die Hard) - close enough, right?
  12. John Cusack
    Suggested by @EthanDawes
  13. Jim Conklin (The Red Badge of Courage) who dies laying in the shape of a cross
    Suggested by @ChrisK
  14. Joan Cusack in every day life ^^^
    Suggested by @EthanDawes