Some people think that Shirley is an uncommon name. It’s not. You come across many more less common names when you’re going about your life. It’s more common than less (being in the 43rd percentile of last names in the US – it’s a bit more common in Texas)
Last time I checked the Houston phone book (which was admittedly a while ago), there were nearly thirty Shirleys and I didn’t know any of them.
Of course, William is a very common name (fifth most common in the 1990 US census).
Almost twenty years ago I met via the internet a guy named Shirley, and then his brother Will. They lived outside of London, were a few years younger than me, and were both in computer work for a living. I always hoped to visit them, but never did. I’ve lost track of them.
Bill Shirley (1921 – 1989) was an actor and singer and singing voice of Prince Philip in Sleeping Beauty (1959).