Peter isn't just for Peter Pan, Peter Cottontail and Peter Rabbit anymore. This Greek name meaning "rock" is also Biblical, one of the twelve apostles (originally named Cephas or Simon, and the first pope), and the name of a Russian emperor - Peter the Great, who built St. Petersburg. There's lots of Saint Peters. There are tons of famous namesakes. There's also the children's nursery rhyme, "Peter Peter Pumkin Eater" and Spider Man, Peter Parker. Petra is the female version. Nicknames include Pete, Petey and PJ.
In 2010 there were 1,918 baby boys named Peter, ranking at #192, slightly down since years before.