You can't really shorten a one-syllable name.
Famous people named Deuce:
Musician/producer Deuce (real name: Aron Erlichman); pro wrestler Deuce (real name: James Wiley Smith Thomas Reiher Snuka); football players Deuce Lutui and Deuce McAllister.
"What the deuce?!" is also a polite way of saying, "WTF?!"