Issara is home to the Hothai and the Chimai. Obviously, they both get their language:

Language: Hothai

Language: Chimai

I wonder if there should be some kind of "High Hothai" language-a ceremonial/ruling/scholarly language in addition to a "common" form of Hothai. Chimai easily stands on its own.

Culturally, Part of me wants to avoid "Hothai lands" as a cultural study, since that's like 3/4 of the world. Could this be a good place to throw it to the community? As part of creating a Hothai character, you need to discuss the tyrant-state this particular Hothai is from? Add a paragraph or two to the worldbook to justify your character's Native Culture Study? That feels like a fair deal to me.

The Chimai have an easy cultural study: "Chimai Confederation", which represents the nascent Chimai nation independent of the Hothai. After that, I'm thinking of "Issaran Wilds" or something, indicative of Chimai (or even Hothai) who live in the deep primordial jungle. That could also cover Gorgons (when and if they show up) and other such deep Issaran denizens.

There's also a "High Telman" language, which is a nice latin analogue that old texts and scientific works can be written in.

And while we're breaking languages out, the assorted Guild-States can have an "old" language they spoke before the Telmans introduced Common to their lands. Old Vevonne, Old Conant, Old Veromani, Old Rytacht.

Kroenig and Tansho are problematic. I'm not sure what to do with them.

The Jade Isles would speak "Lhao", and the Lirrish speak "Lirric". The Galen speak "Galen", which might also be called "Giant" colloquially. And the Falo of course speak "Falo".

The Tritons speak "The Sea Tongue", and the Sahuagin do too, though the Sahuagin are also influenced by the Aboleth, who use a crazy lovecraftian unpronounceable language that no sane creature can learn.

Cultural Studies can exist for every land mass, I imagine. Should people be able to take something super broad, like "Guild States"?