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Rocky Bleier was the second back in the backfield.
Walter Payton, Earl Campbell
O.J. Simpson and Wayne Patrick were the starting backfield for the Bills in 1970 along with Dennis Shaw at quarterback.
From Wikipedia: "The term quarterback has its origin in Scottish Rugby, wherein backfield players, according to their customary distance behind the forwards, were designated 'quarter back' (i.e. ¼ of the way back), 'halfback', and 'fullback'."
At one time in American Football, all four players in the backfield stood fairly close together. One stood slightly behind the rest. He was called the fullback. The backfield players were given names according to how far back they were from the front line or line of scrimmage. The closest player was the quarterback. Then came the halfback(s). Then came the fullback. If a halfback played off to the side, he was a wing back or wing. If he played far out to the side, he was a wide out. Normally halfbacks weighed less than fullbacks. Sometimes, a halfback will play as far back as the full back. Then he would be called a tailback.