Charlotte's hardly popular. In 2015, Charlotte's given to 0.574 % of baby girls, which means that on average, statistically, in an average sized primary school of 250, you're only likely to find one Charlotte in the whole school. If that. You might need two average sized primary schools to find a girl named Charlotte.
I think they must all be in our neck of the woods then! Average sized primary school, two form entry and there are two Charlottes in my daughter's class but I can count at least 3 more that I know of in the school. We clearly live in a very Charlottey area!