The word "Chephren" is primarily spelled with a "ph" instead of an "f" because it is derived from the Ancient Greek name "Khafre." In IPA, "Chephren" would be transcribed as /kəˈfɛrən/. The "k" sound at the beginning is followed by a schwa sound, which is pronounced more weakly than other vowels. The "f" sound is replaced by a "ph" because in Ancient Greek, the letter "phi" represented the /pʰ/ sound. The stress is on the second syllable, represented by a marked accent (/ˈ/).