The native Tainos called it Boriken. Christopher Columbus called it San Juan Bautista. The sailors called it Rich Port which means Puerto Rico in Spanish and the name Stuck. The Constitution calls it...
If you mean the name it was first called Borinken by the natives then San Juan Bautista and finally Puerto Rico. The name is given for the riches colonists found on the island. A myth explaining this...
Puerto Rico was named by the Taino people, Boriken, (Borinquen), When the spaniards arrived to the island they named it San Juan Bautista(Saint John the Baptist), and the capital, Puerto Rico, then...