Well said startail. My children have names that, at the time I named them, were all pretty unusual and under-used, but not necessarily unheard of. One of them (the eldest, who is 19) has remained under-used, although it is definitely a classic and a pretty popular name. (oh fuck it, I'll say it - he is Rory)
The second has a name that was an old classic that was long-due a resurgence, I had never heard of another child called it, but it went on to become extremely popular and ubiquitous later, when he was around 5-10, then it went on the wane a bit, thankfully. But there are enough of them now that it will always be a run of the mill name for his generation. He is a Dave, or a Steve or a Mark! But his middle name is Riley - very unusual for a boy of 17, but very trendy and dare I say 'chav' for a boy of under 4. I had wanted to call him Riley as a first name, but too many people said it didn't go with Rory, and it was just a bit too way out there for most people, so I chickened out. Anyway, I remember everyone falling over themselves over the years to say what a great, unusual, funky name Riley was - and now look! This is where being funky and unusual gets you! Your child has the Chav name. 
DS3 has another highly unusual name which I first encountered when I was about 21 although I didn't have him until I was 33, and I carried it around on the back burner all those years. He is 12 now and I have never met another one, although I have heard through the grapevine that there a few knocking around aged about 5 or 6, but it still remains pretty unusual. If you put it through the Facebook search engine he is only one of two. But that will change. I think it runs the risk of becoming another Riley but I don't care because I love it and I had him first! 
If only we had a crystal ball......right now if I had my time again I'd call my children things like Julian and Penelope, but I would have snorted out loud at those names when my babies were born.