Hannah is a mere mortal whose name was revealed in a What's Your Favorite Word? interview she gave when she was 8, at which point her favorite word is "space" because it it the first word she ever said.
Space Hannah is thus a natural nickname for her to distinguish her from Singing Hannah.
Interview for WYFW[]
"Space" is my favorite word because it is the first word I've ever said. Whenever someone is too close to me, I say SPACE! And sometimes when I have free time, I usually dream off and look into outer space for a little bit. And also, give me my space!
