What's so wrong about making up a new name for a baby, or choosing one that is uncommon?

[Kay]

There is nothing wrong with it per se, but you have to keep in mind a child is going to be saddled with your creative naming experiment for life. Including some very insecure formative years when all they want to do is fit in, not stand out because their name is bizarre to everyone. Not because people are necessarily bullying, but because they haven't heard it before, and are constantly asking how to pronounce it, how to spell it, and how they came to be named that in the first place. Believe me, your son Zorco is going to wish he was Bill or Charlie or Joe a thousand times just so Zorco doesn't become a topic of conversation with every intrigued new person he meets.
I would save the made up names or very unique ones for pets.