Brayden is the top spelling of one of the epidemically popular rhyming cousins of Aiden. It is now at Number 37, after hitting the Top 100 in 2005. Other widely used spellings include Braden, Braeden, Braydon, Braiden, Braedon and Bradyn. Take your pick.
One in the currently modish aden family of boys' names beginning to be used for girls as well as boys.