My family promptly designated "Susie" as my nickname. While "Susie" is cute and appropriate for a 4-year-old darling, I felt a bit silly as a young adult.
Susannah Joyce was used only by my mother. When I heard that name, I knew I was in deep trouble. This is when I wrote my Last Will and Testament.
At some point, I began using "Sue." Perhaps it was the Sue Barton book series about a nurse, which triggered this choice. The shortened version of my name impressed me as sophisticated and grown up.
Of course, I've suffered through some horrific renderings of my name, Susie-Q being the most common. then there was (and please don't tell a soul about this one) Suz-a-la. Shudder. One recent nickname, which I put the brakes on immediately, was Suzinator. For some unknown reason, this reminded me of a refrigerator. Ick. Please do not torment me with these ugly derivatives of my name.
I'm now back to Susan, and using the middle initial "J." You wouldn't think it, but there are other Susan Reinhardt's out there. Fancy that. Except for an occasional, "Suze," used primarily by my dear uncle and my best friend, I'm back to using the name I was given as a newborn.
Naming your characters is as important as naming your children. Some people want unusual monikers, while others like classical or Biblical names. An author friend used names directly related to her characters' personalities.
So before you go with Dick and Jane, check out some baby name sites. If you're writing a historical novel, see what names were popular during that timeframe. Your readers and characters will thank you.