A useful site has come online at http://www.spatial-literacy.org/uclnames/. You can put in a surname and get a map that shows the distribution of that surname in the UK in 1881 or 1998. The surnames are also classified into categories. See the website for explanation of categories. "Pace" is classified as English / Name of Person / Male Personal Name / Corrupted "Pacey" is classified as English / Norman / Norman / Norman Ellen