@newt
Aren't they separate legal "spaces"? I'm pretty sure you can have two different names in two different countries, considering both allow double citizenship and don't prohibit this explicitly with their local laws 🤔
@Paradox
True, but you didn't have that name BEFORE, when you were filling that form, so you weren't relly lying 😉
The banks might have policies about you having to notify them if there are any changes, but AFAIK they can't really enforce it and therefore don't care in most cases. Government institutions… well, like I said — it might depend on local laws and as @newt rightfully noted — they often don't care, unless something major happens.