Question: How often is the Great Sphinx referred to by ancient Egyptians?
About the article "Great Sphinx of Giza", section "Names of the Sphinx".

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The Great Sphinx of Giza ( , ; literally: Father of dread), commonly referred to as the Sphinx, is a limestone statue of a reclining or couchant sphinx (a mythical creature with a lion's body and a human head) that stands on the Giza Plateau on the west bank of the Nile in Giza, Egypt.
The face of the Sphinx is generally believed to represent the face of the Pharaoh Khafra.
It is the largest monolith statue in the world, standing long, wide, and high.
It is the oldest known monumental sculpture, and is commonly believed to have been built by ancient Egyptians of the Old Kingdom during the reign of the Pharaoh Khafra (c. 2558–2532 BC). 
The Great Sphinx is one of the world's largest and oldest statues but basic facts about it, such as when it was built, and by whom, are still debated.
These questions have resulted in the popular idea of the "Riddle of the Sphinx," alluding to the original Greek legend of the Riddle of the Sphinx.
Pliny The Elder mentioned the Great Sphinx in his book, "Natural History", commenting that the Egyptians looked upon the statue as a "divinity" that has been passed over in silence and "that King Harmais was buried in it". 
The Nile valley has been the site of one of the most influential civilizations in the world with its architectural monuments, which include the pyramids of Giza and the Great Sphinx—among the largest and most famous buildings in the world.
The most famous pyramids are the Egyptian pyramids—huge structures built of brick or stone, some of which are among the largest constructions by humans.
Pyramids functioned as tombs for pharaohs.
In Ancient Egypt, a pyramid was referred to as "mer", literally "place of ascendance."
The Great Pyramid of Giza is the largest in Egypt and one of the largest in the world.
The base is over in area.
It is one of the Seven Wonders of the World, and the only one of the seven to survive into modern times.
The Ancient Egyptians capped the peaks of their pyramids with gold and covered their faces with polished white limestone, although many of the stones used for the finishing purpose have fallen or been removed for use on other structures over the millennia.
The Red Pyramid of Egypt (c.26th century BC), named for the light crimson hue of its exposed granite surfaces, is the third largest of Egyptian pyramids.
Menkaure's Pyramid, likely dating to the same era, was constructed of limestone and granite blocks.
The Great Pyramid of Giza (c. 2580 BC) contains a huge granite sarcophagus fashioned of "Red Aswan Granite."
The mostly ruined Black Pyramid dating from the reign of Amenemhat III once had a polished granite pyramidion or capstone, now on display in the main hall of the Egyptian Museum in Cairo (see Dahshur).
Other uses in Ancient Egypt, include columns, door lintels, sills, jambs, and wall and floor veneer.
The ancient Egyptians had some of the first monumental stone buildings (such as in Sakkara).
How the Egyptians worked the solid granite is still a matter of debate.
Archaeologist Patrick Hunt has postulated that the Egyptians used emery shown to have higher hardness on the Mohs scale.
Regarding construction, of the various methods possibly used by builders, the lever moved and uplifted obelisks weighing more than 100 tons. 
Some of the early Egyptologists and excavators of the Giza pyramid complex believed the Great Sphinx and other structures in the Sphinx enclosure predated the traditional date of construction (the reign of Khafre or Khephren, 2520–2492 BC).
In 1857, Auguste Mariette, founder of the Egyptian Museum in Cairo, unearthed the much later Inventory Stela (estimated Dynasty XXVI, c. 678–525 BC), which tells how Khufu came upon the Sphinx, already buried in sand.
Although certain tracts on the Stela are considered good evidence, this passage is widely dismissed as Late Period historical revisionism.
Gaston Maspero, the French Egyptologist and second director of the Egyptian Museum in Cairo, conducted a survey of the Sphinx in 1886 and concluded:"The Sphinx stela shows, in line thirteen, the cartouche of Khephren.
I believe that to indicate an excavation carried out by that prince, following which, the almost certain proof that the Sphinx was already buried in sand by the time of Khafre and his predecessors Dynasty IV, c. 2575–2467 BC.
"In 1904, English Egyptologist E. A. Wallis Budge wrote in "The Gods of the Egyptians":"This marvelous object Great Sphinx was in existence in the days of Khafre, or Khephren, and it is probable that it is a very great deal older than his reign and that it dates from the end of the archaic period 2686 BC."
It is not known by what name the creators called their statue, as the Great Sphinx does not appear in any known inscription of the Old Kingdom, and there are no inscriptions anywhere describing its construction or its original purpose.
In the New Kingdom, the Sphinx was called "Hor-em-akhet" (; Hellenized: "Harmachis"), and the pharaoh Thutmose IV (1401–1391 or 1397–1388 BC) specifically referred to it as such in his Dream Stele.
The commonly used name "Sphinx" was given to it in classical antiquity, about 2000 years after the accepted date of its construction, by reference to a Greek mythological beast with a lion's body, a woman's head and the wings of an eagle (although, like most Egyptian sphinxes, the Great Sphinx has a man's head and no wings).
The English word "sphinx" comes from the ancient Greek Σφίγξ (transliterated: ), apparently from the verb σφίγγω (transliterated: / ), after the Greek sphinx who strangled anyone who failed to answer her riddle.
The name may alternatively be a corruption of the ancient Egyptian "Ssp-anx" (in MdC), a name given to royal statues of Dynasty IV (2575–2467 BC) and later in the New Kingdom (c. 1570–1070 BC) to the Great Sphinx more specifically, although phonetically the two names are far from identical.
Medieval Arab writers, including al-Maqrīzī, call the Sphinx "balhib" and "bilhaw", which suggest a Coptic influence.
The modern Egyptian Arabic name is أبو الهول (, ).