In ancient Egypt, the Sphinx is a male statue of a lion with the head of a human, sometimes with wings. Most sphinxes however represent a king in his appearance as the sun god.
An anacronym is an acronym or an abbreviation so old or familiar that no one remembers what its letters stand for, such as BASIC or COBOL . By the way, an acronym is not just any abbreviation. It's a word that is short for other words, usually using their initial letters.
Eponym refers to a person, real or imaginary, after whom something has been named, as well as to the name itself. These names are found in many different branches of knowledge, industry, and enterprise, and it's not unusual to find eponyms used for company names, places, discoveries, honors, and inventions.