What is "djedefre"

Djedefre (also known as Djedefra and Radjedef) was an ancient Egyptian king ( pharaoh) of the 4th dynasty during the Old Kingdom. He is well known under his Hellenized name form Ratoises (by Manetho). Djedefre was the son and immediate throne successor of Khufu, the builder of the Great Pyramid of Giza; his mother is not known for sure. He was the king who introduced the royal title Sa-Rê (meaning “Son of Ra”) and the first to connect his cartouche name with the sun god Ra.