You bring up a good point Novice Writer, but in your case we're dealing with a subspecies with a population of probably a few hundred thousand, spread across an inland sea about 1000km across, so there's probably enough contact between different parts of your group that they'd share a decent number of words and linguistic structures. There are likely many different simple dialects among your people, picking any one arbitrary term would be suitable enough. Just to be clear, not every Fumo speaks the same language, same for every Amalyap. At this scale, they're probably better described as language families, and over such a long timespan, the language spoken at the start of the update is going to be incomprehensible to the direct descendants of that group by the end of the update. Names for cultures here are for convenience, and to give a bit of a sense for the 'sound' of a people. I suspect that the system will start to better simulate reality once we get to a point where the timescale is smaller.