Possible Clues:

• Family name of Hollywood brothers
• Either "Fargo" co-director
• Either "The Man Who Wasn't There" director
• ''True Grit'' remake surname
• Either 'Barton Fink' director
• Name in the 'Fargo' credits
• Ethan or Joel of 'Fargo' fame
• Film director Joel or Ethan
• Either 'True Grit' co-director
• Either 'Hail, Caesar!' director