Haven't gone through every class combo, but I was thinking of some class titles on a drive home the other day.
Rogue/Ranger = Stalker
Wizard/Cipher = Warlock
Wizard/Priest = Necromancer
Fighter/Rogue = Duelist
Priest/Paladin = Zealot(?)
I will go through the entire list another time. It's quite fun to make come up with these. Perhaps naming our class could be a feature?