What the sheet has to prove
A name change leaves a trail in two places: the decree that allowed it, and the entry the town hall wrote on your birth record. Abroad, the job is to show that both names belong to one person. If you are asking how to apostille a Legal Name Change Certificate, the first task is picking the sheet that shows that link, then getting it signed and sealed.
An apostille is a single stamp one Hague country adds so another country takes the paper with no embassy step. It sits on the signature of the officer who issued your copy. It does not test the story behind the change.
The right desk, and what it costs
Plain register papers go to the Prefettura, the prefecture, which is the state's local office. Court rulings and notarial acts go to the Procura della Repubblica, which sits at the court. You can only apostille a Legal Name Change Certificate in Italy when an Italian office issued and signed the sheet you hand in.
The apostille cost for a Legal Name Change Certificate in Milan is a €16 tax stamp per document, and some papers are exempt, so ask before you pay. Waits at the desk follow the queue. To apostille a Legal Name Change Certificate in Milan without stress, order the sheet and book the stamp in the same week.
Where people send it, and in what tongue
Readers abroad want this sheet when a passport, a degree, a deed or a bank file still carries the old name. Registers and pension offices use it to join two files into one. Send it with the paper it is meant to explain, so the clerk can hold both side by side.
The legalisation of a Legal Name Change Certificate in Milan ends with the apostille when the reader's country is in the Hague group. Most desks then want the wording in their own tongue as an asseverazione, a sworn translation that a court in Italy stamps. Names must be copied letter for letter, so check every spelling twice.