William of Ockham

William of Ockham was a philosopher known for Occam's razor.

The Fifth Doctor told Nyssa, Tegan Jovanka and Marc that he had once met "Billy", as he called him, and that he was a great dancer. William, however, would not let him use his razor. (AUDIO: The Lost Resort)

Panda once mentioned him. (PROSE: Iris Wildthyme and the Unholy Ghost)