I forgot to mention one thing about AS SHE LEFT IT. The main character's name is Opal. In one scene, she mentions how rare it was to have other girls with names starting with "O" in her classes at school.
With the popularity of Olivia, I think O names might be a little more common now. When I tried to think of others, the first one that came to mind was Oline, like Mystery Scene's Oline Cogdill.
Others I came up with: Olga, Ophelia, Ondine, Oprah, Orchid, Orla, Olive - any others you can think of?