I'll give it a 5. I don't care for Susie, but I like Zannie and Zanna / Zannah as nicknames for Susannah. I also prefer Susannah to Susan and Suzanne.
Susannah makes me think of a friendly and down-to-earth, yet energetic girl. I can imagine her as someone who enjoys nature and is a bit of a tomboy, but likes feminine things as well. I picture a Susannah as having long hair.