In Spanish, a man, Juan Gomez, marries a woman, Amelia Sanchez. Juan Gomez remains Juan Gomez. Amelia Sanchez becomes Amelia Sanchez de Gomez. They have a son, Jesus. He is Jesus Gomez Sanchez. He may choose to leave his mother's name off in informal setting or use the initial S. They have a daughter, Gloria. She becomes Gloria Gomez Sanchez. When she marries Jorge Ramirez N., she becomes Gloria Gomez de Ramirez. Their childrens' last name will be Ramirez Gomez. This goes on and on and on and on............