Final answer:
The filmmaker mentioned in the question is George Lucas, whose middle name was inspired by a car company that sponsored a radio show for which his father worked.
Step-by-step explanation:
The car company that sponsored the radio show for which his father worked inspired the middle name of George Lucas. George Lucas, renowned filmmaker, director, and producer, is known for creating the legendary Star Wars franchise. His middle name, Walton, was inspired by the car company Walton Ford Motor Company, which sponsored the radio show where his father worked.