Maddux is a spelling of the Welsh surname Maddox, from the medieval given name Madoc, which is usually explained as "fortunate" or "good". The spelling with x owes its popularity to Hall of Fame pitcher Greg Maddux, who starred for the Cubs and the Braves. Maddux entered the US top 1000 in 2009, peaked at number 945 in 2018 and has slipped to number 1533 in 2025.