Caesar is the only title character in any of Shakespeare's tragedies that does not make it until the end of the play. The title is appropriate because all of the action and decisions characters make still center around their thoughts and opinions on Caesar as a leader.
Another appropriate title might be The Tragedy of Brutus, because his character arc is the most tragic of anyone else. He starts the play so well respected and in charge of his own thoughts and actions. Through the play he descends into being manipulated by Cassius and falls from grace from the public opinion, eventually leading to his death.
