So it occurred to me to wonder about the migration and prevalence of names in history.
It’s a well known phenomenon that (for example) names like Harry and Hermione increased in popularity as a result of the Potter books, and the prevalence of the name Adolf plummeted as of about 70 years ago.
Did this happen in other historical contexts? Did the name Louis see lower popularity in France around 1789? Did the effects spread further than France, to Luis in Spain and Luigi in Italy?
Were there more Abrahams born in 1865 in the USA than 1855? And in perhaps a more complex case, did George become more or less popular around 1776?