Raavan's sons
Meghnaad - The eldest son, known as Indrajeet also. Killed by Lakshman
Naraantak - 
Devaantak -
Trishiraa - 
Matt

Kumbhkarn's two sons
Kumbh  - Killed by Sugreev [6/76]
Nikumbh - Killed by Hanumaan [6/77]

Khar's two sons
Makaraaksh
Vishaalaaksh 

Others
Agniketu
Akampan - killed by Hanumaan [6/56], killed by Angad [6/75]
Ashaniprabh - killed by Dwivid [6/43]
Atikaay -
Dhoomraaksh - Killed by Hanumaan [6/52]
Durdharsh - Killed by Raam [6/44]
Durmukh,
Jaambmaalee,
Kumbhhanu
Mahaakaay - Killed by Raam [6/44] 
Mahaanaad 
Mahaapaarshwa - Killed by Raam [6/44]  Killed by Angad [6/98]
Mahodar - Killed by Raam [6/44], Killed by Sugreev [6/97]
Matt, 
Mitraghn
Naraantak - Killed by Dwivid [6/58]
Pishaach - 
Praghas
Prahast - Killed by Neel [6/58]
Prajangh - Kiled by Angad [6/75]
Pratapan
Rabhas
Rashmiketu
Saaran - Killed by Raam [6/44] 
Samunnat - Killed by Durmukh [6/58]
Sanmukh
Shaardool - who reported about Raam's army at sea shore
Shonitaaksh - Killed by Angad [6/76]
Shuk - messenger of Raavan to Sugreev [6/20], Killed by Raam [6/44]
Vajradanshtra - Killed by Raam [6/44] - Killed by Angad [6/54] Vajrahanu 
Vajramushti
Vidyunmaalee - Killed by Sushen [6/43], Sugreev killed [6/123]
Vikat, 
Viroopaaksh - killed by Lakshman [6/43], Killed by Sugreev [6/96]
Yagyakop
Yagyashatru - Killed by Raam [6/44]
Yoopaaksh - Killed [6/75] 

(see many other names in 6/89)

Taaraa describes Raavan's army as :
1 trillion, plus 36,000 units of warriors - each unit consisting of 10,000 warriors (means 36,000 X 10,000 = 360,000,000)    plus
Hundreds of thousands others
Means 1,000,360,000,000 warriors plus

(from 4/35/15  of Valmiki Ramayana)

Otherwise Hanumaan describes Raavan's army as :
10,000 guards at east gate with swords
100,000 soldiers, along with Chaturanginee army, at south gate
1 million soldiers trained in all kinds of weapons at west gate
1 billion Raakshas in chariots and horses at north gate
12.5 million Raakshas roam around in Lankaa to guard it

Total is:

             10,000          guards at East Gate
           100,000         at South Gate
        1,000,000         at west gate
1,000,000,000         at North Gate
      12,500,000         around in Lankaa
1,013,610,000          Total