Paladin + Chanter = Ringleader
Wizard + Druid = Sorcerer (Basically a Druid who focuses more on his elemental Spells)
Priest + (Fighter/Barbarian) = Zealot (Religious motivatet Fighter)
Paladin + Fighter = Royal Guard(ian)
Chanter + Rogue = Wormtongue (LotR)
Cipher + Wizard = Mentalist (Like Jace the Mindsculptor, erasing memories and stuff)
Druid + Rogue = Warlock
Paladin + Rogue = Assassin (politically motovated Killers? Seems off though)
Monk + Fighter = Shaolin (Wiered because the Monk class is derived from the Shaolin Monks)
Rogue + Cipher = Ghast/Ghost
I like a lot of suggestions in this thread, too.