How do you tell someone their name is wrong?

You take a deep breath and speak to them. Or you can write it in a letter if you prefer. You don’t even have to post it to them; you could send it as an email. It all depends on how direct you want to be with them and fast you want a response. It depends on how urgent you think this is. If you wanted to be novel, you could splash out and hire a skywriter. But the name that they’re using could be a nickname or it’s shortened for something else. The parent could have really liked the sound of the name but was unsure how to spell it. Or maybe they wanted to be unique. It might be for religious, family or cultural reasons. The person in question might not like their real one. But do you really have the authority when someone’s been using it for so long? Does it offend you?