Data on grandparental surnames were obtained from schoolchildren in 22 comm
unes from Campobasso Province, Italy (Molise Region). The distribution of s
urnames was shown to be almost exactly linear by a log(2)-log(2) transforma
tion, which justified the fitting of the data to Fisher's logarithmic distr
ibution. The values for nu were higher among women. When nu was standardize
d to minimize bias due to sample size, the value was one-third the estimate
of migration from exogamy data. The higher values of nu for females indica
te that there is greater mobility of female marriage partners than males.