I added “the notes” to the list.
This list is the whole appendix. (At least my intension is. I might have omitted something by mistake.)
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I like this Obyrith business. I was especially surprised that Pazuzu was now made(?) Obyrith.
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FC1? / Known demon lords
yes ( ) / Abraxas: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Adimarchus: Demon prince of madness. Antagonist of the Shackled City Adventure Path modules published in Dungeon. Detailed in Dungeon #116, page 61.
yes ( ) / Ahazu: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Ahrimanes: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( f ) / Aldinach: Female demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( f ) / Alrunes: Female demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Alvarez: Demon lord. Mentioned in Faces of Evil: the Fiends, p60.
yes ( ) / Alzrius: Demon lord. Mentioned in Hellbound: The Blood War, "The Dark of the War", p25.
yes ( ) / Anarazel: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Ansitif: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( f ) / Ardat: Female demon lord. Mentioned in Monster Manual II (1983), page 35, revealed to be Demon Queen of Harpies in Dragon #341 "Demonomicon of Iggwilv", page X.
yes ( o ) / Areex: Demon prince. Mentioned in Monster Manual II (1983), page 35.
no ( ) / Arlgolcheir: Demon lord. Mentioned in Dragon #116 "Rogue Stones and Gemjumping", page 55; said to have been destroyed.
yes ( ) / Arzial: Mentioned in Dungeon #13, "The Ruins of Nol-Daer".
yes ( ) / Aseroth: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( o,d ) / Asima: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( d ) / Astaroth: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( d ) / Azael: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Azazel: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Baltazo: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Baphomet: Demon lord. Mentioned in Lost Caverns of Tsojcanth; Monster Manual II (1983), page 36; Dragon #341 "Demonomicon of Iggwilv".
yes ( f ) / Barbu: Female demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Bayemon: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( o ) / Bechard: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( o ) / Cabiri: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Charun: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( o ) / Dagon: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Demogorgon: Demon prince. Mentioned in Monster Manual (1977) p16; Wrath of the Immortals boxed set; Monster Mythology, page 88; Book of Vile Darkness, page 125.
no ( ) / Doresain, King of Ghouls: Demigod. Libris Mortis p 16
yes ( ) / Dwiergus: The Chrysalis Prince, mentioned in Dragon #341 "Demonomicon of Iggwilv".
yes ( ) / Eblis: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Eldanoth: Demon lord. Mentioned in Faces of Evil: the Fiends, page 60.
yes ( ) / Eltab: Mentioned in Dreams of the Red Wizards; Spellbound; Champions of Ruin, page 130.
no ( ) / Ereshkigal: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Fraz-Urb'luu: Demon prince. Mentioned in Lost Caverns of Tsojcanth; Monster Manual II (1983), page 39; Faces of Evil: the Fiends, page 60; Dragon #333 "Demonomicon of Iggwilv", page 21.
yes ( ) / Graz'zt: Demon prince. Lost Caverns of Tsojcanth; Monster Manual II (1983), page 39; Book of Vile Darkness, page 130.
yes ( ) / Gresil: Demon lord. Mentioned in Monster Manual II (1983), page 35; Living Greyhawk Journal 10; Dragon #294.
yes ( ) / Haagenti: Lord of Alchemy. Mentioned in Dragon #337 "Demonomicon of Iggwilv", page 47.
yes ( ) / Ilsidahur: Mentioned in Dungeon #10 "The Shrine of Ilsidahur".
yes ( ) / Juiblex: Demon lord. Mentioned in Monster Manual (1977), page 17; Monster Mythology, page 67; Book of Vile Darkness, page 134; Dragon #337 "Demonomicon of Iggwilv", page 47.
yes ( f ) / J'zzalshrak: Female demon lord. Mentioned in Dungeon #64, "Bzallin's Blacksphere", page 29.
new? ( ) / Kardum
yes ( ) / Kerzit: Demon lord. Mentioned in Mordenkainen's Fantastic Adventure; Dungeon #112, pages 13, 52, 96.
yes ( ) / Kostchtchie: Demon lord. Mentioned in Lost Caverns of Tsojcanth; Monster Manual II (1983), page 40; Monster Mythology, page 82.
yes ( f ) / Lamashtu: Demon Queen of Monstrous Births and Deformity. Mentioned in Dragon #329 "Demonomicon of Iggwilv", page 67.
yes ( ) / Laraie: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Lazbral'thull: Demon lord of torture and bloodletting. (Dungeon #122: Root of Evil).
no ( ) / Lindyrm: Mentioned in The Deva Spark.
yes ( f ) / Lissa'aere: Female demon lord. Mentioned in Hellbound: The Blood War, page 25.
yes ( f ) / Lolth: Demon queen of spiders. First debut in module D3: Vault of the Drow and more prominently, in Q1: Queen of the Demonweb Pits. Went on to appear in many other supplements such as first edition Fiend Folio and Deities and Demigods (all three editions).
yes ( ) / Lupercio: Demon lord. Mentioned in Faces of Evil: the Fiends, page 60.
yes ( f ) / Lynkhab: Female demon lord. Faces of Evil: the Fiends, page 61.
no ( ) / Maelfesh: featured in Rose Estes' Greyhawk novels.
yes* ( ) / Malcanthet: The mother of succubi. Mentioned in Dungeon #112, page 48, and #124, page 95.
yes ( ) / Malgarius: A demonic plant that once controlled a layer of the Abyss, but which was defeated by the demon lord Lazbral'thull. (Dungeon #122: Root of Evil).
no ( ) / Malgoth, The: A "terrible entity" that ruled over several layers of the Abyss eons ago. Defeated by a consortium of seven demon lords, who led a fantastic assault on his haunted realm. The victorious demons scattered the Malgoth's essence across the Abyss, only to be deposed and ultimately destroyed by underlings on their home layers. (Dungeon #117: Touch of the Abyss).
yes ( ) / Mastiphal: Demon prince. Mentioned in Monster Manual II (1983), page 35.
no ( ) / Miska the Wolf-Spider: Demon prince. Mentioned in Dungeon #124, page 17. Detailed in 2e adventure Rod of Seven Parts.
yes ( ) / Munkir: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Nekir: Demon lord. Mentioned in Monster Manual II (1983), page 35.
no ( ) / Nergel: Demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( f ) / Nocticula: Demon princess. Mentioned in Monster Manual II (1983), page 35.
no ( ) / Nql: mentioned in Eldritch Wizardry, in the "Codex of the Infinite Planes" entry.
yes ( o ) / Obox-ob: Demon prince. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Orcus: Demon prince. Mentioned in Eldritch Wizardry; Monster Manual (1977), page 17; Dead Gods; Dungeon #89; Book of Vile Darkness, page 136. Was the prominent villain of the Bloodstone series.
yes ( o ) / Pale Night: Female demon lord, mother of Grazzt, Lupercio, and Vucarik. Consort of Baphomet. Mentioned in Faces of Evil: the Fiends, page 61; Dragon #341 "Demonomicon of Iggwilv"; Manual of the Planes (3rd edition), page 100.
yes ( o ) / Pazuzu: Demon prince. Mentioned in Monster Manual II (1983), page 41; Dragon #329 "Demonomicon of Iggwilv", page 56; Book of Vile Darkness web enhancement.
yes ( ) / Rhyxali: Demon princess. Mentioned in Book of Vile Darkness web enhancement.
yes ( ) / Sch'theraqpasstt: Mentioned in Dragon #151
yes ( ) / Sess'innek: Demon lord. Mentioned in Monster Mythology, page 102; Serpent Kingdoms.
yes ( ) / Shaktari: Marilith demon lord. Mentioned in Dungeon #60, "Nemesis", page 32.
yes ( ) / Shami-Amourae: Queen of succubi. Mentioned in Dungeon #5, "The Stolen Power", page 27.
yes ( ) / Siragle: Mentioned in Dungeon #28, "Sleepless".
yes ( ) / Socothbenoth: Demon prince. Mentioned in Monster Manual II (1983), page 35; mentioned in Dragon #333,"Demonomicon of Iggwilv", page 29.
yes ( f ) / Soneillon: Female demon lord. Mentioned in Monster Manual II (1983), page 35.
yes ( ) / Tharzax: Patron of poisonous things that creep and crawl. (Dungeon #123: Salvage Operation).
yes ( ) / Thralhavoc: Demon lord. Mentioned in Hellbound: The Blood War, "War Games", page 56.
yes ( ) / Turaglas the Ebon Maw: Mentioned in Dragon #312.
yes ( o ) / Ugudenk: Lord of Worms and Hungry Parasites. Mentioned in Dragon #333 "Demonomicon of Iggwilv", page 39.
yes ( ) / Verin: Demon lord. Mentioned in Monster Manual II (1983), page 35; Faces of Evil: the Fiends, page 62.
yes ( ) / Volisupula: Mentioned in Planes of Chaos, in the "Chaos Adventures" booklet.
yes ( ) / Vucarik: Demon lord. Mentioned in Hellbound: The Blood War, page 26.
no ( ) / Xazivort: Mentioned in From the Ashes.
yes ( ) / Yeenoghu: Demon prince. Mentioned in Monster Manual (1977), page 19; Monster Mythology, page 83; Book of Vile Darkness, page 140.
yes ( f ) / Yibyiru: Female demon lord; Rancid Lady of Bitter Bile. Mentioned in Dragon #337 "Demonomicon of Iggwilv", page 48.
no ( ) / Zanassu: Mentioned in Empires of the Sands, reported dead in Demihuman Deities.
yes ( f ) / Zuggtmoy: Demoness Lady of Fungi. Mentioned in Temple of Elemental Evil; Dragon #337 "Demonomicon of Iggwilv", page 37.
yes ( ) / Zzyczesiya: Demon lord. Mentioned in Faces of Evil: the Fiends, page 60.
*Not in the Appendix, by mistake. (d=presumed dead, f=female, o=obyrith.)