I only custom name my characters if I can think of a appropriate name.
On the game that I'm playing now I've named some acharacters as follows:

Edgar - Aldao
Terra - Yulis
Shadow - Xios
Sabin - Veras.

All the others I just leave the same, unless I can think of a decent enough name to give them. I mostly correct the names because they're all in capitals in default, & it really annoys me. I accidentally forgot to write Cyan correct & left it CYAN, & it looks so stupid now as the other normally written & this is all in capitals so it looks like this:

Aldao
Yulis
CYAN
Xios

:rolleyes2