I was born in France, I then had my last name changed to add my mother’s maiden name to my last name, and I can legally use either, my French id shows my name and my “usage name”.
Fast forward a few years, I settled in the UK, got naturalised, they dropped all the diacritics and kept only my “usage name” as my last name. You can also change name as many times as you like in the UK, they really don’t care, they’re pretty good at tracking it.
I then got my Italian citizenship by ancestry and there they’re the exact opposite of the British: only under very specific circumstances can you change your name, it has to be a matter of life and death pretty much. So they took my original French name, including the diacritics that nobody knows how to type on an Italian keyboard.
Now I live in Italy, with a different name than my British name, or my French “usage name”, and I have to explain to the clerks how to find me on their system (with my tax code) because they can’t type my name properly.