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Arch Demons (上位魔将,ākudēmon, lit. "High Rank Demonic General") or Arch Daemons are, taking "Lord of Darkness" aside, considered the pinnacle of Demons. Unofficially confirmed and only existing in a few records, being the evolved form of Greater Demons, they are considered legendary Monsters to the general public.
Within the sphere of the Western Nations, the common sense regarding Arch Demons is that it's impossible for a Nameless Demon to be an Arch Demon. The only way for Arch Demons to come into existence is supposedly the case where a strong Greater Demon gets named, evolving into an Arch Demon. Hence a common question when dealing with Demons is "does the Demon have a name?," to ascertain whether the Demon in question could be an Arch Demon or not. However, this common belief is completely wrong. The Primordials, for example, have no problems evolving into Arch Demons even without a name, and likewise can any "pre-historic" or "Marquis" rank of Demons forego any such limitations.
It is possible for Greater Demons to become Arch Demons just from "the public" unintentionally naming a Greater Demon based on a legend or tale.