It's not the baby's real name - just an affectionate nickname until they've decided on it's real name.
People shouldn't be so bloody judgemental about what people call their children - chosing a name is such a subjective thing and very personal.
I'm sure every one of you thinks your child/ren have the most lovely names - and of course you would.
Just as I'm sure Katie and Peter will be perfectly happy with the name they eventually choose too.