Jauregui, Pinon, and Contreras

I have been researching some early 1800's with Jauregui, Pinon, and Contreras in Mexticacan and find some confusing entries with De Jauregui, De Xaurigue, Pinona, Contreras De Arse, Garcia and Gomes Jauregui; as they relate to Delgadillo Prieto. Any leads and suggestions would be greatly appreciated.
Raymond Medrano