Kelly Errin Herndon (born November 3, 1976) is a former American football cornerback. He was originally signed by the San Francisco 49ers as an undrafted free agent in 1999. He played college football at Toledo. Although he entered his first NFL camp in 1999, Herndon waited until 2002 to play in his first NFL game. The wait included two training camps with the San Francisco 49ers, one with the New York Giants, one season in the XFL, a spring in Barcelona with NFL Europe and one season serving on the Giants’ and Denver Broncos practice squads.