A map of surname distribution across the United States
Here’s the color key for the national origins of those surnames.
It’s unsurprising that so much of the country is some shade of blue. What is interesting, however, is that we have so many Smiths, Williams, and Jones in this country partly because of slavery. Many freedmen ended up with their former masters’ last names, which is why approximately 1 in 5 “Smiths” are African American.