The variables of sponsorship (number of sponsors, endogamic or exogamic sponsors, transmission of the name to the godchildren) provide information on the type and level of expectations of the parents towards their friends in terms of solidarity. In Auvergne, the analysis of baptismal registers of the sixteenth century reveals bipolarity between the north and the south. In the South, the needs of mutual assistance are provided mainly by the close kinship, in the context of family solidarity. It would seem that this social system was also used in northern Auvergne at the beginning, but that it had undergone at the end of the Middle Ages the influence of the system used in the countries of language of oil, more based on solidarities of neighborhood.