It is said that Estefania came to Monterrey with her father and children. Making it seem that Alberto was not a part of the family. It could be that they took up the name of the Mom because he was not around or they thought that their mother’s surname was better. In those times they could choose whatever surname they chose even one from the grandparents.

As to the town you mention I am not familiar with it. But to find records for it you will need to know the time period because boundaries changed all the time.