This topic might have a better name.
Surname does not seem to be spoken or in the credits of Rose.
Talk about it here.
Caroline Finch was the wife of Clive. She was shocked that a girl came to see her husband's research on the Doctor. While out shopping, her son and she witnessed Clive's death at the hands of an Auton during their attempted invasion of Earth. She and her son ran from the Autons. (TV: Rose)