This is one of those cosmetic moves that many athletes make when facing adversity. Similar to when a person will cut their hair before going to court, the name change symbolizes a rebirth and a change in attitude.
Jones changing his name is a nice little gesture but it will mean very little if he is unable to change his actual actions. Understandably the Pacman Jones image was not working well for him. However, I highly doubt it was the name that caused him to want to make it rain at every opportunity he had. Let's hope for Adam's sake the name change will lead to a change in attitude in his personal life and better choices.