His forename, Madison, is derived from マジシャン (read as "Majishan"), which, in turn, is the Japanese pronunciation of Magician, one of the Major Arcana Tarot cards, a reference to Big Bang's naming motif.
Interestingly, his surname, Ballada, is derived from バラード (read as "Baraado"), which, in turn, is the Japanese pronunciation of ballad.