a few caveats Background information a few caveats not all births before 1937 were counted Social Security Administration Background information about the baby names data SSA http://www.ssa.gov/OACT/babynames/background.html Background information Background information Background information there are caveats SSA Popular Names Background Information Social Security Administration Background information Background information Social Security card application data Background information a few caveats Background information about the baby names data Background information about the baby names data