Are you dead? Check the US Social Security's "Death Master File" and find out
The Death Master File is a list of corpses. It's the official list of dead people in the US, and-theoretically-includes every US citizen who has died since 1936, when Social Security numbers were first issued. As with any giant database controlled by a bureaucracy, it has issues. Journalist Paul Ford discusses some of these issues in the New Republic's "The Final File."
To see how many times your name has been born and has died, when your name was trending, and how popular your name is among dead people overall, check out the New Republic's interactive web app, Death Master File.
Cover image: Wikipedia