In our house we call 'em Big Bush and Baby Bush.
I don’t know, Big Bush makes me think of an alternative theory for the beginning of the universe (or possibly its end), and Baby Bush makes me think of this.
I had never heard the number designation, by the way, and it took me some time to figure out what they meant…
I call him Bush the Greater, but by default. It’s necessitated by his son’s title, Bush the Lesser.