I suppose this isn't 100% related to naming conventions, but I figure it's something I'd tack on here since it might have some influence on things.

I've always wondered, do the Garleans have their own written and spoken language? It seems like something that they would have, but we as characters simply would have no idea because we have the Echo and can understand everyone anyways.

It's never been mentioned in-game to my knowledge, either, so there's no telling there. If they do, I wonder what sort of accent they might have.

We know what some Eorzean accents are like across various regions of the country, simply by the way text is conveyed and voice actors in certain cutscenes. I've always pictured the Garlean language might be something akin to a mix of German/latin with thick, heavy accents.