Is munoz a Puerto Rico last name?

Yes, Muñoz is a common surname in Puerto Rico. It is the 14th most common surname in Puerto Rico, with an estimated 45,000 people bearing the name. The surname Muñoz is of Spanish origin, and it is derived from the Latin word "munius," which means "defense." The surname Muñoz was first brought to Puerto Rico by Spanish settlers in the 16th century, and it has since become one of the most common surnames in the country.