Names and Rank in the Infernal Region (alphabetically)

Apollyon (Abaddon) : King of Demons
Abigor: Horseman with a scepter and lance, commanding 60 legions
Adremelech: Chancellor and High Council of Demons
Aguares : Grand Duke of Eastern region, commanding 30 legions
Alocer : Grand Duke , commanding 36 legions
Amduscius : Grand Duke, commanding 29 legions
Andras : Marquis , commanding 30 legions
Asmodeus (Asmoday) : Head of Casinos, banished to the desert by Raphael
Astaroth : Grand Duke of Western region, Lord Treasurer
Aym : Grand Duke , commanding 26 legions
Ayperos : Prince, commanding 36 legions
Azazel : Standard Bearer of Armies, also known as Satanael.
Baal : Commanding General of the Infernal Armies
Baalberith : Chief Secretary and Archivist (second order demon, Berith)
Balan : Prince
Bearded Demon : Remains nameless to avoid his use in search of the Philosopher's Stone (King Solomon)
Beelzebub (Beelzebuth) : Prince of the Demons, Lord of the Flies, second only to Satan
Belial : Prince of Trickery, Demon of Sodomy
Belphegor : Demon of Ingenious discoveries and wealth
Buer : Second order demon but commands 50 legions
Caym : Grand President of the Infernal
Charon : Boatman who ferries souls across the river Styx
Chax : Grand Duke
Cresil : Demon of Impurity and slovinliness
Dagon : Baker and member of the House
Eurynomus : Prince who feeds on corpses
Furfur : Count , commanding 26 legions
Geryon : Giant centaur, guards hell
Jezebeth : Demon of Falsehoods
Kasdeya : According to the "Book of Enoch", the fifth Satan
Kobal : Entertainment Director, patron of Comedy
Leonard : Inspector General of Black Magic and Sorcery
Leviathan : Grand Admiral: androgynous ( Christian myth says he seduced both Adam and Eve)
Lilith : Princess of Hell. ( Hebrew myth is that she is a succubus)
Malphas : Grand President, commanding 40 legions
Mammon : Demon of Avarice
Mastema : Leader of the offspring of fallen angels by humans
Melchom : Treasurer of the House
Mephistopheles : Some versions a servant of Lucifer, others Satan himself
Merihim : Prince of Pestilence
Moloch : Another demon of Hebrew lore
Mullin : Servant of the House of Princes, Lieutenant to Leonard
Murmur : Count, Demon of Music
Naburus : Marquis, connected with Cerberus
Nergal : Chief of Secret Police, second order demon
Nybras : Grand Publisist of Pleasures, inferior
Nysrogh : Chief of the House of Princes, second order demon
Orias : Marquis, Demon of Diabolic Astologers and Diviners
Paymon : Master of Ceremonies
Philatanus : Demon assisting Belial in furthering sodomy and pedophile behaviors
Proserpine : Princess of Hell ( some say, close to Persephone of Pagan traditions)
Pyro : Prince of Falsehoods
Raum : Count, commanding 30 legions
Rimmon : Ambassador from hell to Russia, also known as Damas
Ronwe : Inferior, yet commands 19 legions
Samael : Angel of Death, Prince of Air
Semiazas : Chief of Fallen Angels
Shalbriri : Demon that strikes people blind
Sonneillon : Demon of Hate (Michaelis )
Succorbenoth : Chief Eunuch of the House of Princes, Demon of Gates and Jealousy
Thamuz : Ambassador of hell, Creator of the Holy Inquisition, Inventor of Artillery
Ukobach : Stationary Engineer
Uphir : Demon physician
Valafar : Grand Duke
Verdelet : Master of Ceremonies of the House of Princes
Verin : Demon of Impatience
Vetis : demon who specializes in corrupting and tempting the holy
Xaphan : Stokes the furnace of hell, second order demon
Zaebros : Animal - human combination
Zagan : Demon of Deceit and counterfeiting