Charley is, at this point, an old-fashioned spelling for the most popular short form of Charles, better known these days as Charlie. But Charley is a classic and relates more directly to Charles. While the y ending may be more traditionally masculine than ie, girls named Charley outnumber boys six to one, while Charlie is split nearly evenly between the sexes. If you're considering naming your son Charles and styling his nickname Charley, be aware that with 20 times more male Charlies than Charleys, you and your child will face constant misspellings.

Charlie and its many forms are on the rise -- including Charley, which relates more directly to the male formal name Charles. Surprisingly, though, while the number of girls and boys named Charlie are nearly even, there are six times as many girls named Charley than boys. The Charley spelling is now a fixture in the Top 600, though it remains less popular than Charlee for girls.