Quote Originally Posted by Holyhunter View Post
Roegadyn have (or had) their own language before they came to Eorzea. Sea Wolves' names are all based on it.

It even has a dictionary on the forums
http://forum.square-enix.com/ffxiv/t...dyn-Dictionary
And it could be assumed that Miqo'te had their own language, too, as the sounds of their language changed into match the Eorzean alphabet.