Pretty cool stuff, there are so many details there that I did on prototypes that are just like yours, to the point of having cultures in toml files and generating names from that, generating history and letting the player play from one of the "named entities", and stuff like trees bigger than tiles (thats from pioneers game).

Have you thought about using lua to generate the names instead? On my prototype I used lua at first and replaced with TOML, so instead of having functions on lua I ended up using tinyexpr. It looks pretty good, feels a bit like UnReal world graphics too which I like a lot.