Looking for Cordero/Flores from Tlajomulco, Jalisco Mexico.

I have researched my grandmother's family from Tlajomulco,Jalisco, Mexico. Her mother's family surname was originally Cordero Torres and around 1887 I noticed a surname change to Flores. The records show where my grandmother's mother & grandfather's surname where changed from Cordero to Flores in some records. Her grandfather's sister,Felix. also started out with the surname Cordero Torres & later became Flores. Records pertaining to Felix's grandchildren also named her as Flores. Anyone out there who experienced a surname change? Here are the other surnames I'm rsearching from the same town: Gomez-Gonzalez, Zuniga-Morillo, Solorzano-Gomez.