This name is spooky. I like it, but it seriously spooks me. It's fun in that it gives me chills like a ghost story. It makes me think of an abandoned old building, or deep black water. It's beautiful, but definitely eerie.
I would use the full version too. I tried to shorten it to just Hanna, but I had to keep going over the "lore" edge. :) This name has momentum.