I wouldn't expect a lasting increase more of a S curve. Movie comes out, there is a spike in Dorothy usage. A few years pass and the original spike slows down

I wouldn't expect a lasting increase more of a S curve. Movie comes out, there is a spike in Dorothy usage. A few years pass and the original spike slows down. Then the movie is seen as old fashioned and you start to see a negative trend. Then Dorothy is seen as an old lady's name so it sees an even sharper decline.