I know very little about the "
Vargas Machuca"
My great grandmother was from Guanabacoa,
La Habana, Cuba.
Many years ago there was a spaniard officer with the name of
Vargas, who was fighting the "moros" in Spain, using a heavy bat, hitting them in the head (machucandosle las cabezas)
reason why was known as "Vargas-Machuca" and condecorated for his actions.
TO SMASH=MACHUCAR
I am sorry this is the little I know about this surname.
Wish you luck in your search
The "Nuñez
de Villavicencio" and "González
del Valle"
were prominent families in Cuba.
Cástulo