Have namechanged in case person i'm talking about is a member.
My SIL had a son and gave him a certain name - which can be shortened.
Since birth she has never called him by his full name and insists on calling him by this shortened version (which to me is nothing more than a nickname)
To all of her friends its really cool that her soon has this shortened name. And my DH reckons that she doesn't like the full name at all and that is why she uses the shortened one, and he also reckons that she does it to impress her friends with her 'cool' ways. (She named him after her and DH's Uncle who passed away while she was pregnant) DH reckoned that she only gave him the name to bring the family's focus back to her after the funeral.
AIBU to think that she should have named him something she intended to call him. I realise that its not really my place to say what she should be calling her son, but to me its just daft to give your child a name and then NEVER use it.