So, I've been trying to create a list of all the unique fiends confirmed/ name dropped to exist in Golarion. Here's what I came up with. Could anyone list any more that I've missed? I did include Lamshtu and Asmodeus, and, counting them, I know of 207 in all.
Archdevils
1. Asmodeus
2. Baalzebul
3. Barbatos
4. Belial
5. Dispater
6. Geryon
7. Mammon
8. Mephistopheles
9. Moloch
10. Typhon (Dead)
Whore Queens
1. Ardad Lili
2. Eiseth
3. Doloras
4. Mahathallah
Infernal Dukes
1. Alocer
2. Astaroth
3. Bifrons
4. Caarcrinolaas
5. Crocell
6. Deumus
7. Eaqueo
8. Eligos
9. Furcas
10. Gaap
11. Glasya Labolas
12. Haborym
13. Iaozrael
14. Jiraviddain
15. Kalma
16. Lau Kiritsu
17. Lorcan
18. Lorthact
19. Losarkur
20. Malthus
21. Nahema
22. Nergal
23. Orobas
24. Ose
25. Pirias
26. Quindiovatos
27. Rasvocel
28. Ruithvein
29. Ruzel
30. Sabnach
31. Titivillus
32. Uruskreil
33. Vapula
34. Vassago
35. Vois
36. Wylgart
37. Xaphan
38. Xhasnaphar
39. Yangantytan
40. Zaebos
41. Zagan
42. Zepar
Malbranche
1. Alichino
2. Barbariccia
3. Cagnazo
4. Calcabrina
5. Circiatto
6. Draghignazzo
7. Farfarello
8. Graffiacane
9. Libicocco
10. Malacoda
11. Rubicante
12. Scarmiglione
Demon Lords
1. Lamashtu
2. Abraxas
3. Aldinach
4. Andirifhku
5. Angazhan
6. Areshkagal
7. Baphomet
8. Cyth V’sug
9. Dagon
10. Deskari
11. Flauros
12. Gogunta
13. Haagenti
14. Jezelda
15. Jubilex
16. Kabriri
17. Kostchtchie
18. Mazmezz
19. Mestama
20. Nocticula
21. Nergal
22. Orcus
23. Pazuzu
24. Shax
25. Shivaska
26. Sifkesh
27. Socothbenoth
28. Urxehl
29. Xoveron
30. Yhidothrus
31. Zevgavizeb
32. Zura
Nascent Lords
1. Daclau Sar
2. Izyagna
3. Kalvakus
4. Kholerus
5. Menxyr
6. Murnath
7. Nightripper
8. Ovonovo
9. Shamira
10. Sithhud
11. Treerazer
12. Yamasoth
Dead Lords
1. Aolar
2. Ibdurengian
3. Mhacah
4. Vyciavaxus
5. Xar Azmak
Horsemen
1. Apollyon
2. Charon
3. Szuriel
4. Trelmarixian
Harbingers
1. Aesdurath
2. Ajids
3. Anogetz
4. Arlachramas
5. Braismois
6. Cixyron
7. Corosbel
8. Diceid
9. Ealdeez
10. Folca
11. Geon
12. Hastrikhal
13. Jacarkas
14. Laivatiniel
15. Llamoleok
16. Mneoc
17. Nalmungder
18. Osolmyr
19. Pavnuri
20. Roqorolos
21. Ruapceras
22. Slandrais
23. Stygidvod
24. Tamede
25. Tresmalvos
26. Uaransaph
27. Vorasha
28. Xsistaid
29. Zaigasnar
30. Zelishkar
Dead Horsemen
1. Lyutheria
2. Azulos
3. Drulaema
4. Yrsinius
5. Horeksin
6. Roshmolem
7. Ortaro
8. Balishek
Asura Ranas
1. Aghasura
2. Andak
3. Bohga
4. Chugarra
5. Chupurvagasti
6. Daissiad
7. Gavidya
8. Holika
9. Hydim
10. Ioramvol
11. Maeha
12. Onamahli
13. Rahu
14. Rytara
15. Taraksun
16. Vritra
17. Zurapadyn
Div Rulers
1. Ahriman
Kyton Demagogues
1. Barravoclair
2. Fharaas
3. Inkariax
4. Morrobahn
5. Raetorgash
6. Sugroz
7. Vevelor
Oni Daimyo
1. Akuma
2. Chimon
3. Guyuku
4. Inma
5. Muronna
6. Nataka
7. Onmyuza
8. Ushitora
9. Uzumae
10. Yabu
Rakshasa Immortals
1. Aksha
2. Bundha
3. Caera
4. Dradjit
5. Hudima
6. Jyotah
7. Kunkarna
8. Mursha
9. Otikaya
10. Prihasta
11. Ravana
12. Surpa
13. Vibhishah
14. Zabha
The Oinodaemon.
Rovagug.