Origin of Catarina Jauregui

I have just found a 1906 Valle de Guadalupe baptism that lists my maternal grandfather-in-law and mother-in-law as sponsors and gives me some info about them, but I need a little help. The microfilm is poor and flowering script is almost driving me mad. Here is what I think it says .....padrinos Julian Alviso casada labrador de cuarenta an~os originario de San Miguel y su esposa Catarina Jauregui de veinte y ocho an~os de edad originaria del hijo de Ayaca y vecinos de Mexcala......

I am pretty sure it states Julian is married, a farmer and 40 years old from San Miguel, and his wife, Catarina Jauregui is 28 years old. But then it says Catarina is a "son of Ayaca"? The word hijo is questionable as the h and i are looped together at the beginning which looks like a large "o" with a small "o" inside, but the "jo" at the end is definite. I tried to find Ayaca out on the Interent, but I could not find the place name even in the little site listed from a previous Nuestros forum topic. Is anyone familiar with the term or place Ayaca? I have found it referenced as a type of tree. Also, why would Catarina be listed as a hijo and not a hija? The place Mexcala is the Ranch where most of the younger children were born.

Thanks again for any help!