The book based on the film gives Boo's "real" name as Mary Gibbs, the name of her voice actress who also happens to be the daughter of Rob Gibbs who worked as a story artist on the film.
The book based on the film gives Boo's "real" name as Mary Gibbs. Mary Gibbs is the name of her voice actress. This name of her voice actress also happens to be the daughter of Rob Gibbs. This Rob Gibbs worked as a story artist on the film.