Mage
Archmage
Priest
Divine Priestess or Divine Priest
Warrior
Warbringer
Rogue
Scoundrel (low level title)
Master Assassin
These are the titles I would actually be excited to work for and are a few examples of what I came up with in just a few short minutes.
What can you come up with as a title for your class?
Keep it short though, we don't need another "Champion of the Frozen Wastes"