My name is Joanna. As a girl and teenager I went by Jo, because I thought it sounded ' cool' and then as I've got older I use Joanna. I've never had another Joanna in my classes, which I like, but it's not such an unusual name that people haven't heard of it. There's loads of nickname potential for this name and it's a name that has a long history. One thing I've always found really annoying is that people often call me Joanne...which is a different name and I hate it, I've had to correct people my whole life with that. You wouldn't call a Nicola Nicole, so why call a Joanna Joanne?!