In some ancient civilizations the Wolf was a symbol of the underworld. In Egypt, the guardian of the dead was Anubis who was a wolf-headed god. The jackal portrayed as black was the symbol of both death and regeneration.
William is also the one who hid inside the suits and kidnapped and killed children, leading to the assumption that William Afton is The Purple Guy of FNaF 2 and 3 (he is killed at the end of the book when Charlie sets off the spring locks in his suit).
(Variations: gonef or gonif or gonof or gonoph or ganef or ganof or guniff) A thief; a person who is in effect a thief, like an unethical salesperson: And who is this arch-goniff?/ a gonof like Glick/ all the other gonophs, consultants who peddle bullshit, builders who build badly (1845+)