As a Casey (last name), I've been intrigued by the transitions over time. It would be interesting to map this to major events. For example, the #2 name "Jackie

As a Casey (last name), I've been intrigued by the transitions over time. It would be interesting to map this to major events. For example, the #2 name "Jackie" switched from a heavily boys name to a heavily girls name about 1/3 of the way through the data set which would be around 1960. Also in 1960, JFK was elected and his wife was "Jackie" Kennedy. She became First Lady and a fashion icon immediately.