I would like a table of the frequency of surnames by first letter i.e. surnames starting with A are x% of the population, starting with B are y% etc etc. I am not looking for individual surname frequency, so there should be no privacy concerns here, I want them aggregated up to the starting letter only. This could be a snapshot in time from a specific census, but even better if I could have a range of times to also see how the frequency distribution might have changed over time.

This is for a book that I am writing