Thread:Кримера/@comment-4923977-20160905184049/@comment-8695373-20160906081438

That is a fan-excuse for cross-names and stuff, since the Japanese usually don't bother with such things. But it's a logical assumption, based on what happened in their world.

After the Dark War, the world's population was decreased by half, and people built 23 Hierarchical Cities to survive. Each one of them is like a country (and Torifune is similar to our Liechtenstein in size), with a lot of cities and towns on each hierarchy - that is what those layers are called.

These cities are names after Japanese deities, because the developers of the game are Japanese. If that doesn't sound like a good reason, remember that cities of XBlaze and Bloodedge Experience (Shin Yokosaki and Shin Kawahama) are named after Yokohama, the city where Arc System Works' headquarters is placed, and Kawasaki, its neighbouring city.

The twelve families of Duodecim got their last names from the twelve months, in Japanese. Because the developers are Japanese, right.

Since there was no instance of "language barrier" in the game, it's safe to assume that after the war everyone started to speak the same language. Or maybe there is a special translating Ars, but it's unlikely. And that language is not necessary Japanese, since Ragna's wanted poster is in English. And there is also only one known currency unit in the world, so it seems like the mankind really lives as one nation.