A typographic map of the top 25 surnames in each US State, their frequency and their country of origin.
“What’s in a Surname? A new view of the United States based on the distribution of common last names shows centuries of history and echoes some of America’s great immigration sagas. To compile this data, geographers at University College London used phone directories to find the predominant surnames in each state. Software then identified the probable provenances of the 181 names that emerged.
An interactive version of the map is available on National Geographic (they’re running a printed version in the February magazine). Details behind the project are from Spatial Analysis.