According to some Christian theology, many Pagan deities are demons. So, when names of demons are spoken, one must consider that they were incorporated to Christian demonology, as were Jewish demons, Pagan deities, folkloric supernatural beings, and sometimes imaginary names given by people interrogated under torture during the witch trials, by mentally ill persons (energumens) that were considered possessed, imaginative priests, etc.
In this way, we have Jewish names like Asmodai (Book of Tobit), Azazel (Leviticus 16:8-10), or Belial (Deuteronomy 13:13, Book of Judges 19:22, Books of Samuel, part 1, 1:16, 2:12 10:27 and 25:17, and part 2 16:7 and 22:5, Books of Kings part 1, 21:10-13, Books of Chronicles, part 1, 13:7); Semitic deities like Adramelech, Baal (see Baal (demon), Baal was also a general Jewish name for a false god), Ashtaroth (derived from Astarte); Greek, Roman and Egyptian names like Bifrons (See Bifrons (demon)), Lamia, Phoenix (see Phenex); and so on. All biblical references were taken from the Vulgate.
Lilith, a female demon important in Judaism, does not count in Christian demonology. However, the newer generation of demonologists (and some modern exorcists/deliverance counsellors) recognize Lilith as a general demon, the argument being that if other Judaic demons exist in Christian demonology, so should Lilith as well, introducing her as the wife of Samael, and as a princess and queen of Hell. Also, from the aforementioned 'everything other than God and His angels, if spirit, is demon' vein of reasoning - we find valid logical reasoning for there being a 'Lilith demon' - if simply to create confusion and add validity to the following of Lilith as deity.
Some grimoires like The Great Book of Saint Cyprian, Le Dragon Rouge, Pseudomonarchia Daemonum and The Lesser Key of Solomon (see Ars Goetia) among others provide us of more of these names.
Sebastien Michaelis in his classification of demons (see Michaelis' classification of demons) gives more names.
Abaddon, an angel of destruction extracted from the Bible (Book of Revelation 9:11) was also incorporated as a different demon.
Lucifer, Beelzebub and Satan, were originally one Devil who was transmogrified into three different characters by demonology and the Devil remained as such. Beelzebub was a separate entity in Judaism, later appearing as a fallen angel, and Satan is the leader of fallen angels: while Lucifer was originally an unnamed angel, the one who talked Satan into joining him in the rebellion. Whether all three (as well as other names such as Baal) are considered the same being or different depends on opinion.
Goblins, drudes, Familiars and other folkloric creatures became part of Christian demonology.
Thus there is little agreement on who is whom, for many names that originally were only one being have been separated into several entities. Others have been "created" by people, like Sonnilon, Olivier (demon), Raum, etc. Many demons have several spellings of their names, not all of them with a valid fundament.
Some of these demons are mentioned in the bible, but have no official names, such as the Raging Demon, or some of the demons that were cast out by Christians during the time of the New Testament, or by Jesus Christ.
Also, many deliverance counselors and exorcists in modern times, such as Dr. Ed Murphy in his book "The Handbook For Spiritual Warfare", cite examples of demons named after the afflictions they cause, or the effect they produce. In his book, Dr. Murphy retells his encounters with multiple demons manifest in a lady named Betty, naming themselves through use of her vocal cords, with names such as "Hellbent" (its purpose was to ensure Betty's place in Hell (although it was defeated)); "Unbelief" (purposed to inspire exactly what it's named for) and "Destroyer" (meant to destroy the victim's spirit).
Famous quotes containing the words names and/or demons:
“Shut out that stealing moon,
She wears too much the guise she wore
Before our lutes were strewn
With years-deep dust, and names we read
On a white stone were hewn.”
—Thomas Hardy (1840–1928)
“Until you have a son of your own . . . you will never know the joy, the love beyond feeling that resonates in the heart of a father as he looks upon his son. You will never know the sense of honor that makes a man want to be more than he is and to pass something good and hopeful into the hands of his son. And you will never know the heartbreak of the fathers who are haunted by the personal demons that keep them from being the men they want their sons to be.”
—Kent Nerburn (20th century)