Martínez de Sotomayor vs. Martín de Sotomayor

Hi All, does anyone know if these two families are one in the same? I ve seen occasions when both names are used and others not. Martínez de Sotomayor and Martín de Sotomayor both tend to be in upper Los Altos and Aguascalientes. Does anyone know the patriarch of this (these) families. I have many of them in early 1600s but not sure if they are all siblings. -Daniel