Surnames: A new source for the history of social mobility

This paper explains how surname distributions can be used as a way to measure rates of social mobility in contemporary and historical societies. This allows for estimates of social mobility rates for any population for which we know just two facts: the distribution of surnames overall, and the distribution of surnames among some elite or underclass. Such information exists, for example, for England back to 1300, and for Sweden back to 1700. However surname distributions reveal a different, more fundamental type of mobility than that conventionally estimated. Thus surname estimates also allow for measuring a different aspect of social mobility, the underlying average social status of families. This is the aspect that matters for mobility of social groups, and for families across multiple generations.