Kingreaper
Adventurer
Actually, as an addendum I think there is one class where level titles were cool, and that's because the class already has a strong implied setting: The monk.
Monk
1: Novice
2: Initiate
3: Brother
4: Disciple
5: Immaculate
6: Master
7: Superior Master
8: Master of Dragons
9: Master of the North Wind
10: Master of the West Wind
11: Master of the South Wind
12: Master of the East Wind
13: Master of Winter
14: Master of Autumn
15: Master of Summer
16: Master of Spring
17: Grand Master of Flowers
Even there: What if I want to focus on abilities associated with the dragon school?
I have to become a Grand Master of Flowers anyway?
The problem with names by level is that they're never just names for levels of prowess, they always have other connotations.
ie. Evoker: One who uses Evocation
Lancer: One who uses Lances
Master of Winter: One who fights with a hard, slow, style
So the fact that there can't be a 16th level Master of Winter is just... odd.