...because for example I know loads of Johns and they are (nearly) all perfectly well adjusted despite never being the only one in their class.
The common names when I was at school were Dean, Dwayne and Samantha - always more than one of them per class. They all came across as individuals though.
So there.
What I do care about though is a celebrity chose the name we have chosen if we have a ds a few years ago and I don;t want people to think we are copying them. Sigh. Still, most people won't even know the name of that celebrity's child - I just read a lot of magazines!