This website gives the approximate number of people with a particular surname in all countries: http://forebears.io/surnames
It spits a number, for example "1500 people", but the problem is that I don't know if that's high or low, because I don't have the average to compare it to...
If we picked a random person, what's the average number of people that have the same surname as that person?
Either for the whole world, for the U.S., for France, or for the U.K., any would be good enough.
It would be even better if you could also provide the median and the standard deviation.
And it would be even even better if you could provide a histogram representing the percent of people who carry a surname carried by between k*1000 and (k+1)*1000 people, i.e. with the x-axis representing bins “Surnames carried by between k*1000 and (k+1)*1000 people” and with the y-axis representing the percent of people.