I hear you on Bartz. Barts doesn't quite look right. Bart is valid, but it makes you think of The Simpsons. I do not want to journey with a hero named Butz, Buts, Buttz, or Butts. There is always the option of doing something weather related like Haze. Or perhaps Fog or Fogg (since that brings up the protagonist from Around the World in Eighty Days.) I only suggest this because so many FF characters have weather-related names like Cloud, Squall, Tide (okay Tidus), Lightning...
Or google words for quest or adventure or something cool in foreign languages. I once named a character Ascarya because I thought she was totally awesome, and in Sanskrit that means amazing and wonderful.
Sometimes I wonder if I should try reworking the letters of Dincrest into other feminine names (a few I got are: Tesi, Tresi, Trisé, Cresti, Cristé, Rié, and Enid) but nothing quite works like Cresta.