Bubba is an ancient Anglo-Saxon surname that came from the son of Bubb, where it was originally derived from a group of Baptismal surnames meaning of Bubb. The surname Bubba was first found in Suffolk, where evidence suggests they held a family seat well before the Norman invasion of the 11th century.
Former President Bill Clinton has had a lot of nicknames, like Slick Willie, often used in the pejorative to refer to his alleged sexual misconduct with Monica Lewinsky and other prominent female accusers; The Comeback Kid, coined by press after strong second place showing in 1992 New Hampshire primary, following polling slump; The First Black President, used by Toni Morrison in reference to the African-American tropes surrounding Clinton's candidacy; The Big Dog, used by several media outlets in regard to his post-presidential popularity...
...but his oldest nickname is Bubba, which his family has called him since he was a child!