DJCupboard said:
And you know, I never noticed before, of the many demons and devils the D&D creators named after demons and devils from bible, how many of them showed up in the bible.
Most medieval names for the Devil (and demons) were usually one of the following:
1) Cna'anite deities which were, ofcourse, villified in the monotheistic Old Testament: Ba'al (Baal), Ba'al Zvoov (Beelzebob), Ashtoreth (Astarte/Astoreth) and so on.
2) The name "Satan", actually referring to an angel in the service of God who've convinced God to test the faith of poor old Job; the "Devil" is a very late concept, introduced into Judaism (and, later on, Christianity and Islam) from a dualistic Persian faith (IIRC); he was later identified with Satan. Lilith is the name of a Cna'anite goddess who was later, in Talmudic Judaism, used to refer to the Devil's consort.
3) Mistranslations and outright misunderstanding of Old Testament text. IIRC, "Leviathan" (whale in Hebrew) was originally referred to in the Book of Job as something which is beyond man's limited power (that specific part of the Book of Job talked about how Man was inferior to God, despite of that time's technology. The passage talked about how man can't catch Leviathan (i.e. a whale) by hook. Somehow the fact that the word "Leviathan" appeared in the same book which has introduced Satan into Judaism gave rise to the identification of Leviathan with Satan.
4) Medieval myth, usually given Latin names: Succubus, Incubus.
But I think that most D&D demons have made-up names (i.e. not originating from previous mythologies or religions) given "demonic-sounding names". The main exception to this is the Succubus, a Medieval demon. I don't think that Glabrezu (sp?), Baatezu and so on have any origion outside of Gygax's imagination.