Definitions of Bart:

• noun:   a member of the British order of honor; ranks below a baron but above a knight

  Example: "Since he was a baronet he had to be addressed as Sir Henry Jones, Bart."

• name:  A male given name (rare: 1 in 7142 males; popularity rank in the U.S.: #574)
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #10674)