My grand son is officially named "Jaia J" in his birth country but when we applied to to have him getting the Swiss citizenship (my and his mother home country) we have been told that the Swiss Authority doesn't accept "J" as second name, that we should initiate an official Name change in his birth country to remove or change it and then we would be able to apply for the citizenship!
(our blessing is that they are not asking for a sex change!)
(Bloody Swiss narrow mind)