I absolutely don't like it.
Nancy is just one of those unattractive and very much dated names. A name best left on someone born, say, during the 60's and before. Completely out of place on a very younger individual.
According to the statistics, the name has been decreasing for a while. In my honest opinion, I hope it drops off soon. It should have left the charts DECADES ago. A name best left in the past.