Because of the massive numbers of duplications of him as a fetus, to be eaten by the enslaved peoples in Fafe Times, Prince William's energy signature is essentially synonymous in certain criminal systems and devices with those times. Essentially as a programming shortcut, and for other reasons, people intended to be sent to Fafe Time by various criminals are often sent into close proximity with Prince William's energy signature.
See: William Atreides of Terra and Andor, A Blue Baby For Food