“Visions of Gideon” is one of the two original Sufjan Stevens' songs (the other one is “Mystery of Love”) from the soundtrack for Call Me By Your Name.
Dr. Gideon Fell is the main detective of most of John Dickson Carr's mystery novels under his own name. The books involving Fell were usually cleverly-plotted locked-room mysteries like "The Hollow Man" and "He Who Whispers."
The defendant in the United States Supreme Court case, Gideon v. Wainwright, was Clarence Earl Gideon. The Court's decision held that state courts had to provide counsel to criminal defendants who could not afford an attorney, a landmark case which guaranteed rights under the Fifth and Sixth Amendments to the Constitution to not only federal defendants, but state-charged defendants, as well.
Gideon Gordon Graves is the main antagonist in the Scott Pilgrim book series. He was played by Jason Schwartzman in the film "Scott Pilgrim vs. The World".
Season six of the popular Witch-themed dramedy "Charmed" introduced a powerful Elder named Gideon. ( http://en.wikipedia.org/wiki/Gideon_%28Charmed%29 )He assited Leo when Leo first became a Whitelighter, supported Leo and Piper's marriage, and was headmaster of Magic School (think a Professor at Hogwarts, like McGonagall or Dumbledore). He also happened to try the entire sixth season to kill baby Wyatt (Leo and Piper's son) for the "greater good," seeing that Wyatt would grow too powerful.He fails, and ends up being killed by Leo, but before he dies, he manages to kill Wyatt's younger brother (who came to the past to save Wyatt) Chris (my favorite character in the entire show). In an alternate future, Gideon's attempt on Wyatt's life caused Wyatt to instead of die, turn evil.
That Benedict Arnold-type character, and sacrifice anything for the "greater good" morality, is all I can think about from this name.