In books they'll speak of characters who don't fit their names, something that almost never happens in real life. On some level I cannot describe, our names mold our personalities, until you can't possibly be imagined as being called something different. People who go by their middle names or nicknames don't seem to match their first names at all, but the one they go by instead. I've always wondered how I would be if I had been named differently....
So, when I have kids, the first thing I'll do is call them whatever they feel like being called that moment. They'll grow up with no real name and be themselves 100%
And yes, I know the above is impossible, and no, I will not stop thinking about what that would do personality-wise.
It's a fascinating subject anyways, no? I wonder if online usernames have a similar effect.