It seems that the first Nuncios in Mexico appear about 1698 in the Yucatan. From there they spread to Zacatecas and Coahuila and then Nuevo Leon. My ancestors came to Saltillo about 1710. This seems to be an earlier migration to cuba then the one you spoke of in your message. Is there any hint of an earlier migration on your side of the ocean?
Thanks,
Esther