Sometimes, you stumble over one of those Internet memes and you can't help but check it out.
On some blog, I found How many of me? and of course, I had to check it out.
I'm not sure how reliable this is (and I have the vague notion I've done it before but my memory sucks these days). Anyhow - here are the results:
My name: 4 other people in the US with the same name
Leah: 4 (Leah Marie, which is her actual name, yields "1 or less")
Other than David (it's a family name, so no surprise there), the names are not too common. That's a good thing, I suppose. My bestest friend also has a result of "1 or less", also no surprise there.
My maiden name, btw, results in the simple answer "1". I guess I became more, um, common with my wedding. :-)