Just like those who were natural born citizens by jus soli, and just like those who were natural born citizens by jus sanguinis, they were called either "citizens" or if you wanted to be more specific, "natural born citizens."
Of course.
There have only ever been two kinds of citizens: natural born citizens, and naturalized citizens.
... which begs the question of just why you overlapped them.
Why didn’t you just put two separate circles floating by their lonesomes? That would be more in keeping with your apparent belief, that there is no significance to any overlap, that it’s meaningless to the point of never, EVER having been named.