An eponym is a person, a place, or a thing after whom or which someone or something is, or is believed to be, named. The adjectives which are derived from the word eponym include eponymous and eponymic.
Usage of the word
The term eponym[2][3] functions in multiple related ways, all based on an explicit relationship between two named things. A person, place, or thing named after a particular person share an eponymous relationship. In this way, Elizabeth I of England is the eponym of the Elizabethan era, but the Elizabethan era can also be referred to as the eponym of Elizabeth I of England.
When Henry Ford is referred to as "the eponymous founder of the Ford Motor Company", his surname "Ford" and the name of the motor company have an eponymous relationship. The word "eponym" can also refer to the title character of a fictional work (such as Rocky Balboa of the Rocky film series), as well as to self-titled works named after their creators (such as the album The Doors by the band the Doors).
Periods have often been named after a ruler or other influential figure:
One of the first recorded cases of eponymy occurred in the second millennium BC, when the Assyrians named each year after a high official (limmu).
In ancient Greece, the eponymous archon was the highest magistrate in classical Athens. Eponymous archons served a term of one year which took the name of that particular archon (e.g., 594 BC was named after Solon). Later historians provided yet another case of eponymy by referring to the period of fifth-century Athens as The Age of Pericles after its most influential statesman Pericles.
The Hebrew Bible explains the origins of peoples through individuals who bear their name. Jacob is renamed "Israel" (Gen 35:9) and his sons (or grandsons) name the original 12 tribes of Israel, while Edomites (Gen. 25:30), Moabites and Ammonites (Gen. 19:30-38), Canaanites (Gen. 9:20-27) and other tribes (the Kenites named after Cain[citation needed] (Cain's life is detailed in Gen. 4:1-16)) are said to be named after other primal ancestors bearing their name. In most cases, the experiences and behavior of the ancestor is meant to indicate the characteristics of the people who take their name.
In ancient Rome, one of the two formal ways of indicating a year was to cite the two annual consuls who served in that year. For example, the year we know as 59 BC would have been described as "the consulship of Marcus Calpurnius Bibulus and Gaius Julius Caesar" (although that specific year was known jocularly as "the consulship of Julius and Caesar" because of the insignificance of Caesar's counterpart). Under the empire, the consuls would change as often as every two months, but only the two consuls at the beginning of the year would lend their names to that year.
During the Christian era, itself eponymous, many royal households used eponymous dating by regnal years. The Roman Catholic Church, however, eventually used the Anno Domini dating scheme - based on the birth of Christ - on both the general public and royalty. The regnal year standard is still used with respect to statutes and law reports published in some parts of the United Kingdom and in some Commonwealth countries (England abandoned this practice in 1963).
Government administrations may become referred to eponymously, such as Kennedy's Camelot and the Nixon Era.
British monarchs have become eponymous throughout the English-speaking world for time periods, fashions, etc. Elizabethan, Georgian, Victorian, and Edwardian are examples of these.
Many astronomical objects are named after their discoverer or another person.[13]
In art:
Plays, books, and other forms of entertainment may have eponymous names, such as the ancient Greek epic The Odyssey, derived from its principal character, Odysseus, and the novel Robinson Crusoe.
The term is also used in the music industry, usually with regard to record titles, where it is prevalent and leads to confusion. For example, Bad Company's first album was entitled Bad Company and contained a popular song named "Bad Company". Parodying this, the band R.E.M. titled a 1988 compilation album Eponymous. One especially convoluted case of eponyms is the 1969 song "Black Sabbath", named after the 1963 movie Black Sabbath; the band that wrote the song changed their name to Black Sabbath and released it on the album Black Sabbath.
In tribal antiquity, both in ancient Greece and independently among the Hebrews, tribes often took the name of a legendary leader (as Achaeus for Achaeans, or Dorus for Dorians). The eponym gave apparent meaning to the mysterious names of tribes, and sometimes, as in the Sons of Noah, provided a primitive attempt at ethnology as well, in the genealogical relationships of eponymous originators.
However, some eponymous adjectives and noun adjuncts are nowadays entered in many dictionaries as lowercase when they have evolved a common status, no longer deriving their meaning from the proper-noun origin.[16] For example, Herculean when referring to Hercules himself, but often herculean when referring to the figurative, generalized extension sense;[16] and quixotic and diesel engine [lowercase only].[16][17] For any given term, one dictionary may enter only lowercase or only cap, whereas other dictionaries may recognize the capitalized version as a variant, either equally common as, or less common than, the first-listed styling (marked with labels such as "or", "also", "often", or "sometimes"). The Chicago Manual of Style, in its section "Words derived from proper names",[18] gives some examples of both lowercase and capitalized stylings, including a few terms styled both ways, and says, "Authors and editors must decide for themselves, but whatever choice is made should be followed consistently throughout a work."
When the eponym is used together with a noun, the common-noun part is not capitalized (unless it is part of a title or it is the first word in a sentence). For example, in Parkinson disease (named after James Parkinson), Parkinson is capitalized, but disease is not. In addition, the adjectival form, where one exists, is usually lowercased for medical terms (thus parkinsonian although Parkinson disease),[19] and gram-negative, gram-positive although Gram stain.[20] Uppercase Gram-positive or Gram-negative however are also commonly used in scientific journal articles and publications.[21][22][23] In other fields, the eponym derivative is commonly capitalized, for example, Newtonian in physics,[24][25] and Platonic in philosophy (however, use lowercase platonic when describing love).[14] The capitalization is retained after a prefix and hyphen, e.g. non-Newtonian.[14]
English can use either genitive case or attributive position to indicate the adjectival nature of the eponymous part of the term. (In other words, that part may be either possessive or non-possessive.) Thus Parkinson's disease and Parkinson disease are both acceptable. Medical dictionaries have been shifting toward nonpossessive styling in recent decades.[26] Thus Parkinson disease is more likely to be used in the latest medical literature (especially in postprints) than Parkinson's disease.
National varieties of English
American and British English spelling differences may apply to eponyms. For example, British style would typically be caesarean section, which is also found in American medical publications, but cæsarean section (with a ligature) is sometimes seen in (mostly older) British writing, and cesarean is preferred by American dictionaries and some American medical works.[27]
AMA Manual of Style lowercases the terms roman numerals and arabic numerals. MWCD enters the numeral sense under the headword Roman but with the note "not cap" on the numeral sense.[16]
