Let me add one.
Pike from the Chicago Bears. Hes the one who made the Famous 4-6 Defense.
He played Free saftey for the bears when he came up with the idea for a "46 Bear Defense" That many teams use today.
Even though the defense has a 50 front, and 3 linebackers, and the name might confuse people with the 4 and 6, but its named after him, just like the 53 defense.
Here at my school, we have 3 defenses. 53 Base, 46 Bear, and VooDoo
53: 5 down linemen, 3 backers, zone, backers move to trips
46: 5 down line, 3 backers, man (we use this against the power teams such as power I and Veer)
Voodoo: 3 down line, 2 extra DB's go out. (Use this against the spread teams, with just one tailback in the backfield)
I dont know alot about anything besides the line, becaue I play Defensive tackle, but I know enough to explain it.