There’s Beyoncé and Madonna, Cher and Prince. And now Hillary. It may not be exactly the same as the long list of celebrities known by their first names. But Hillary Clinton has become known simply as Hillary in bumper stickers and headlines, on Twitter and Facebook, around water coolers and in coffee shops. Yet some Americans, mostly women, don’t think the former secretary of state, U.S. senator from New York and first lady should be called by just her first name.