It's much more interesting to look at the way popularity of names changes over time. For lists of American baby names dating back over a hundred years, look at http://www.ssa.gov/OACT/babynames/index.html.

Or for a Java tool that displays the way different names become more or less popular in a graph, follow the link from http://www.babynamewizard.com/namevoyager/.

As for Sharon, she peaked in the 1940's (Rank:8), dropping every decade since (1950s: 14, 1960's: 23, 1970s: 63, 1980s: 169, 1990s: 331)