I know a lot of people didn't like XII (though I liked it other than the storyline.) But the names of the Espers from that game and tactics were never really used for anything else except for games that involved Ivalice. The names are really interesting and I could see players liking them as server names if we had 13 servers. (Unless I scratch out the three they probably wouldn't use due to popularity or something similar.)

Belias
[strike]Chaos[/strike]
Zalera
Zeromus
Hashmal
[strike]Ultima[/strike]
Exodus
Cúchulainn
Shemhazai
Adrammelech
Famfrit
Mateus
[strike]Zodiark[/strike]