Francis Smart of the Econometrics by Simulation blog first pointed this out the other day. He notes that the drop is especially striking, given that the popularity of “Hillary” was rising sharply upward until 1992 or so, the year the Clintons first came on to the national stage.

The number behind these charts comes from the Social Security Administration, which maintains a database of baby names going back to the late 1800s. For a sense of how unusual the Clinton effect on the name “Hillary” has been, look at the charts below. They plot the trajectories of the names of all presidents and first ladies since the Reagans, for the years starting in 1970.