I don't really know what our world is called, other than Titan Hell. It doesn't seem to be a variant of Earth, at least. Though the year was 850, so even if would be a variant of Earth, it'd be quite far in the past.

There are three others here from the same world. [He refuses to say Mikasa's gone forever so there.] There's me, Eren, Mikasa and Armin.

And no, we don't know what Disney is...