The island average corresponds to the sum of the weighted contribution of each municipality. Weights were calculated from Martínez-Cruzado et al. (2005) [29]. SES values correspond to low (1), medium
[N(INE)] is the official population size (Padrón municipal 2008). [N(tokens)] is the number of occurrences of the [S = tokens] different single surnames (ex: from Rodriguez Diaz we obtain two tokens:
