Daemon is also simply the original latin spelling of the word. In this context its interesting to note that the original meaning of the greek daímōn and latin

Daemon is also simply the original latin spelling of the word. In this context its interesting to note that the original meaning of the greek daímōn and latin daemon had no intrinsic connotation of evil. It simply was a kind of "spirit", a non-corporeal entity that somehow interacted with the human plain of existence. Looked at it this way, the use of the word in *nix systems makes perfect sense: A non-corporeal, neutral entity, that interacts with the world at large, goes mostly unseen, and its interactions are (for most daemons) close to userland.