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. n. 1. a name, esp a place name, derived from the name of a real or mythical person, as for example Constantinople from Constantine I. 2. the name of the person from which such a name is derived: in the Middle Ages, Brutus was thought to be the eponym of Britain . [C19: from Greek epÅnumos giving a significant name].