The word "salsa" is a Spanish word that means "sauce." It comes from Latin. Molina he did not invent or coin the word "salsa."
Rumor has it that Alonsa de Molina invented the word "salsa." Alas, this isn't really possible. While it might be true that Molina called a tomato-based sauce "salsa," he did not invent the term. The Spanish word "salsa" comes from Latin: the language that Spanish evolved from. The prefix "sal-" means salt.