They are, supposedly, the name of Grant and Vivian's future children.
Explanation:
The names Molly Wiggins, Paul Wiggins and Paulette Wiggins are mentioned when Grant and Vivian are thinking about the future, how they would live together and what their children's names would be and how they would raise them. The first name to be quoted was Molly Wiggins, but Vivian does not like the name because she believes it is not a name for a decent girl as their daughter will be. So after much thought they decide that they will have two children and that the names will be Paul and Paulette Wiggins.
