Unfortunately, demons are always trying to kill angels and there really is no given name for them, except demons. I did some searching about it nonetheless and came up with some interesting links. I've always been fascinated with the names of demons. http://www.sff.net/people/neelk/in_nomine/setting/opposite.html http://www.wordiq.com/definition/Demon (read the part about the hebrew bible, maybe you can use some of those names) and if you just want a million names to browse through: http://www.steliart.com/angelology_angels_demons_chart.html