@kevin- exactly!

I'm not sure if the study went into any depth or not about why the kids were named as such. A similar study was done in the book "Freakonomics" which I suggest everyone should read. It seems in reality that usually lower income, crime ridden, etc. areas of the country, have mothers that are more likely to give their kids obscure names. This does not imply that the name is what caused them to be criminals, but rather; where they come from. This study was geared toward the obscure black kids names that you hear so often, like "Juwan", "Guquanda", or whatever else you can come up with to make your baby "special".
As steohawk said: "In other words, correlation doesn’t necessarily imply causality."