>> The largest and most famous sphinx is the Great Sphinx of Giza

The largest and most famous sphinx is the Great Sphinx of Giza, situated on the Giza Plateau adjacent to the Great Pyramids of Giza on the west bank of the Nile River and facing east (29°58′31″N 31°08′15″E). The sphinx is located southeast of the pyramids. Although the date of its construction is uncertain, the head of the Great Sphinx now is believed to be that of the pharaoh Khafra.

Great Sphinx Before Clearance. Giza. 4th Dynasty

What names their builders gave to these statues is not known. At the Great Sphinx site, the inscription on a stele by Thutmose IV in 1400 BCE, lists the names of three aspects of the local sun deity of that period, Khepera–Rê–Atum. The inclusion of these figures in tomb and temple complexes quickly became traditional and many pharaohs had their heads carved atop the guardian statues for their tombs to show their close relationship with the powerful solar deity, Sekhmet, a lioness.

Other famous Egyptian sphinxes include one bearing the head of the pharaoh Hatshepsut, with her likeness carved in granite, which is now in the Metropolitan Museum of Art in New York, and the alabaster sphinx of Memphis, Memphis, Egypt, currently located within the open-air museum at that site.

Back of Sphinx, Giza Egypt

The theme was expanded to form great avenues of guardian sphinxes lining the approaches to tombs and temples as well as serving as details atop the posts of flights of stairs to very grand complexes. Nine hundred with ram heads, representing Amon, were built in Thebes, where his cult was strongest.

Perhaps the first sphinx in Egypt was one depicting Queen Hetepheres II, of the fourth dynasty that lasted from 2723 BCE to 2563. She was one of the longest-lived members of the royal family of that dynasty.

The Great Sphinx has become an emblem of Egypt, frequently appearing on its stamps, coins, and official documents.
(source)