1. There is twelve. Well, thirteen, if you count X2. And I don't know how many if you count the horrible American versions of, like, two through five.
2. It's called Final Fantasy because when Square made it, they were doing really bad, and they thought it would be their final game. But it did so well that they kept making sequals. Or sequils. Whatevo. Anyway, that is why it's called Final Fantasy, even though none of them have been the final one.