Below is the list of the classes. I'm using a lot of obscure terms from various cultures. Mostly mythology, but some other stuff too (Korean, Chinese, Mesopotamian, Greek, Bulgarian, Roman, Celtic, etc). There's also a few Biblical names. Others are just in the theme of Titan Quest. None are made up words.
Lich Only = Lich
Khloros Only = Fallen
Dokkaebi Only = Dokkaebi
Sekhmet Only = Menfyt
Venefici Only = Veneficus
Tartarus Only = Devilbringer
Mind Only = Cerebralist
Berserker Only = Berserker
Poseidon Only = Avatar
Berserker + Lich = Gatekeeper
Berserker + Khloros = Thracian
Berserker + Dokkaebi = Vandal
Berserker + Sekhmet = Warlord
Berserker + Venefici = Scythian
Berserker + Tartarus = Hellthirst
Berserker + Mind = Fury
Mind + Lich = Shade
Mind + Khloros = Vasal
Mind + Dokkaebi = Anunnaki
Mind + Sekhmet = Vizier
Mind + Venefici = Prophet
Mind + Tartarus = Vexillarius
Tartarus + Lich = Infernalist
Tartarus + Khloros = Extispicist
Tartarus + Dokkaebi = Fiend
Tartarus + Sekhmet = Flamekeeper
Tartarus + Venefici = Heretic
Venefici + Lich = Archmage
Venefici + Khloros = Guojiu
Venefici + Dokkaebi = Shaman
Venefici + Sekhmet = Amaumnetan
Sekhmet + Lich = Ammit
Sekhmet + Khloros = Axex
Sekhmet + Dokkaebi = Bennu
Dokkaebi + Lich = Dybbuk
Dokkaebi + Khloros = Karakorum
Lich + Khloros = Decayer
Poseidon + Berserker = Leviathan
Poseidon + Mind = Votary
Poseidon + Tartarus = Bathyal
Poseidon + Venefici = Mystic
Poseidon + Sekhmet = Vanguard
Poseidon + Dokkaebi = Abzu
Poseidon + Khloros = Tiamati
Poseidon + Lich = Euxine
