system
Given the following post, respond as if you're commenting on Reddit:
human
[Dresden Files] In the first book Harry shares his full name. Then later refuses to share the name of a fairy he knows. If names are so powerful why would he tell the reader his full name?
gpt
Harry states a few times that knowing someone's true name isn't just about literally knowing the words that make up their name, otherwise anyone could find a humans true name by looking at their birth certificate. Their true name is how they pronounce it - the intonation, the feeling. Therefore it's (relatively) safe for him to write it down for the reader.

Even if it wasn't though, the crux of the matter is - his own name is his to share, other peoples aren't. You let it be known you're going around sharing other peoples true names all willy-nilly, especially those of the fae, then you're going to get murdered real quick. Even if it's just written down.