» Fri Nov 12, 2010 9:45 pm
The http://www.esotericarchives.com/solomon/goetia.htm (or http://en.wikipedia.org/wiki/Ars_Goetia#Ars_Goetia) comes to mind, as it's supposedly a guide to the various demons in existence, giving them ranks (duke, prince, etc) and describing their spheres, as well as showing how to summon each one. Of course, they likely had many influences. An idea is rarely a single thought, but a combination of many threads which breathe life into the thoughts of old (and the TES series draws from many myths, which I rather like. No one stands to prominence as in other games, where the origins can be fairly obvious.)
The name, though, does seem to come from http://en.wikipedia.org/wiki/Daemon_%28mythology%29 (demon is a bit more limited, being only evil. Daemon, though, can be either or in between). Take away the -mon and replace it with -dra, and you have Daedra.) http://en.wikipedia.org/wiki/Daeva seems even closer, though, and the Zoroastrian version seems similar to the Daedra:
"In the Gathas, the oldest texts of the Zoroastrian canon, the daevas are 'wrong gods' or 'false gods' or 'gods that are (to be) rejected'."
"In the Younger Avesta, the daevas are noxious creatures that promote chaos and disorder."
"Although the daevas are clearly identified with evil (eg Yasna 32.5), they are not identified as evil. They deceive mankind and themselves but they are not aka mainyu"
Also, though it's a bit off topic, the similarity between Clavicus and Clavicula made me wonder. Though Latin isn't a part of the TES world, it may have been used when making the original name, as in Nocturnal.
Clavicula: (small) key; vine-tendril; pivot; rod, bar, bolt (for door)
Vile: cheap, common, mean, worthless
Clavicus Vile: the common key? It makes some sense as he resides over rituals and pacts.
Of course, from what I gather, the Daedra's actual names are unknown, as they use nicknames or whatever people assign to them instead. TES apparently picked up the myth about divine names having power (the reason why the figure of God in Judaism and Christianity never gives them his real name, only allowing them to call him, "I am that I am" or "YHWH," usually shortened to just I AM or replaced with other names and titles like Adonai/Lord.)