What is the definition of nominal symbolism in literature?

The symbolism in which an author uses when choosing a name for his/her characters.

For example; An author may name a character "John Goodman" because the first name is a solid name, and the last name suggests that he is a "good man".

The references or symbols can be as cheesy and obvious as that one, or more in-depth and cryptic. An accomplished author doesn't just name their characters random names.