I've always had a soft spot for it - it's my grandmother's name. She goes by Dot/Dottie. I would have loved to honor her with it, but she has always hated her name and her nickname, so we went with her middle name, Rosalie. She actually told me to never name any child Dorothy.
And since my DD is on a Wizard of Oz kick, I can't get that connection out of my head!