I don't know how common it is, but I know a few children (all boys) that are almost exclusively called by their first and middle initial (JC, JP, JJ, AJ, KD, etc.). I've always thought it was cute and said I'd do that if I ever had a boy. Our daughter's initials are going to be DJ, and I'm now thinking that I'd like to call her that mostly. Just wondering what others think of this idea. Does it work for a girl?