The 37 different surnames of US presidents can be compared with each other in many different ways. This paper looks at them in one, two, and three dimensions - along a line, on a plane, and in space, showing which ones are neighbors and which ones are outliers.
Eckler, A. Ross
"Letters of the Presidents,"
Word Ways: Vol. 37
, Article 17.
Available at: https://digitalcommons.butler.edu/wordways/vol37/iss4/17