I usually don't change their names and just keep the defaults. However, when I played the fan-translated Hard Type, I did the following changes: *prepares to get bashed by Zeromus and Kishi *

Cain --> Kain
Gilbert --> Edward
Tella --> Tellah

I'd have changed Golbeze to either Golbez or Golbeza, but he never joins your party, so you can't get to rename him.