AI civ's name

As the title says, I don't know how to name the 3rd civilization which will be a attackable and some kind of your rival in the game. I have some names, but you can add more if you'd like.

1. Southern Tribes;
2. Helios;
3. Maxima/Terra Proxima;
4. Maxima/Terra Ultima;
5. Caledonia Ultima(North of Scotland);
6. Ruthenia Proxima( Russia);

I would like to thank you for the support and I hope that you enjoy this game:))