Final answer:
Central America is the name commonly given to the countries that lie between Mexico and South America.
Step-by-step explanation:
The name commonly given to the countries that lie between Mexico and South America is Central America. Central America includes the countries of Mexico, Guatemala, Honduras, Belize, El Salvador, Nicaragua, and Costa Rica.
These countries form the final connection between North America and South America and are located south of the Tropic of Cancer.