This message is late and I hope you find it. My Grandfather's name in Leonard Jesus Goodfield(b.1901)and his fathers name was Jesus Goodfield and I believe that his fathers name is Joseph Goodfield. Goodfield was not the original name. My theory is that the original name was Whitfield(Scottish orgin), changed to Guitfil due to spanish phonetic spelling, and then was changed to Goodfield after California became a state. All three surnames appear in various census at one time or another.
Paul Carroll(brother) has written on this site concerning the Altamirano's. So, I think you are on the right track.