An impossible task, unless it's broken down by decade, and even then it would be a very hard task because players - before every household had a TV - didn't get the same type of exposure.
1920s - Red Grange, Jim Thorpe
1930s - Bronko Nagurski, Don Hutson
1940s - Sammy Baugh
1950s - Otto Graham
1960s - Johnny Unitas, Bart Starr, Jim Brown, Broadway Joe
1970s - Walter Payton, Lynn Swann, Terry Bradshaw, and .....
YouTube - Coca-Cola Classic ad: Mean Joe Green [Full Version] (1979)
1980s - Joe Montana, Jerry Rice, and Eric Dickerson
1990s - John Elway, Brett Favre, Deion Sanders
2000s - Tom Brady, Peyton Manning, Ray Lewis