Well, I am the youngest of 3 girls. Growing up, my mom found that everyone would shorten their names. So, 13 years after my middle sister was born, I came along as a huge surprise and a bit of a mistake (my mom says I was the best mistake she ever made - aww). So it was decided I would be given a name that couldn't be shortened - hence Claire.
However, instead everyone adds to it, and now a lot of people call me clairabell - including my step daughter who calls it me when I have done something wrong lol.