I'm not sure this post has been made but I wanted to ask what you called your aeons or even Tidus, but I doubt any of us changed his name:
Valefor - Going to change the name to Celeste
Ifrit - Nasher
Ixion - Arceus
Shiva - Suciune
Bahamut - Going to change the name
Yojimno - Joker
What did you call yours? Many people may have not changed the names because you liked before but I'm playing this the last time and I plan to complete this with different names.