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]
Atikaaya -
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] 

Taaraa describes Raavan's Army thus :
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

My doubt is "where were they living in such a small area?" Any ideas?
[from Valmiki Ramayan, 4/35/15]
----------------------------------------------------------------------------

Hanumaan describes Raavan's Army to Raam thus :
10,000       Ogres (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

[from Valmiki Ramayan, 6/3/24-28]