Down's syndrome is an eponym for the English physician John Down.    From Wordnet, Princeton University. 

Constantine I is the eponym for Constantinople.    From Wordnet, Princeton University. 

Noun : Brut, the supposed grandson of Aeneas, is the eponym of the Britons.    From Dictionary.com. 

An eponym is an honor, and these two men are not worthy.    From Wordnik.com.  [Archive 2003-01-01] Reference

The deal summoned up another eponym from days gone by.    From Wordnik.com.  [Charles Schwab Shells Out for U.S. Trust] Reference

June 12th, 2006 at 1:04 pm eponym correction — wolcotts.    From Wordnik.com.  [Firedoglake » Time Magazine Launches Bukkake Festival] Reference

When a new word is named for a person, it's called an eponym.    From Wordnik.com.  [Robert Creamer: Congratulations to Andrew Breitbart -- He May Have Succeeded in Having a Word Named After Him] Reference

FYI, another perineal identifier around these parts is the eponym?.    From Wordnik.com.  [Ambiguous Goo: The Opacity of Marketing] Reference

#48 Sally: My S.O. has just told me that the word poubelle is an eponym.    From Wordnik.com.  [French masterclass] Reference

His name has become an eponym for traitor, especially a collaborationist.    From Wordnik.com.  [Think Progress » Santorum: ‘I Think The Focus Should Not Be Iraq, It Should Be Iran’] Reference

Someone you needs to stop seeing racism in an eponym, which was actually my point.    From Wordnik.com.  [The Volokh Conspiracy » California High School Sends Kids Home for Wearing American Flag on Cinco de Mayo] Reference

Someone (you) needs to stop seeing racism in an eponym, which was actually my point.    From Wordnik.com.  [The Volokh Conspiracy » California High School Sends Kids Home for Wearing American Flag on Cinco de Mayo] Reference

Had he never lived, we would now celebrate Cabot Day or Hudson Day or some other eponym.    From Wordnik.com.  [Stromata Blog:] Reference

The first I saw in person yesterday morning on the Manhattan Bridge as I headed into its eponym.    From Wordnik.com.  [Leaving The Irony On: So Much for Sincerity] Reference

She has an entire political dogma named after her, whereas his only eponym is a slump in the gold markets.    From Wordnik.com.  [Tony Blair: The Next Labour Prime Minister?] Reference

The authors suggest in their closing paragraph that the eponym be disgarded, as it has “fallen into disfavor”.    From Wordnik.com.  [Archive 2003-01-01] Reference

In each case, a distant echo of Gray's "Elegy" serves to widen the social distance between Clare's speaker and his eponym.    From Wordnik.com.  [Like] Reference

Its common name is an eponym, referring to Dr. Max Wilms, the German surgeon (1867-1918) who first described this kind of tumor.    From Wordnik.com.  [Steve Anderson: My Hero: 6 Year-Old With Cancer Named Pablo] Reference

I've been using the eponym for over seven years on my (virtually unread) blog and for almost as long on the (widely read) DailyKos.    From Wordnik.com.  [Who Are You People? « PubliCola] Reference

Assyrian historical inscriptions, dates the events by the name of the eponym for the year, and, still more unusual, by the month as well.    From Wordnik.com.  [Assyrian Historiography] Reference

The maverick's eponym was a guy who refused to brand his cattle -- McCain is putting the branding iron to anything he can get his hands on.    From Wordnik.com.  [Biden Won, Because He Made Forceful Case Against McCain] Reference

A word that evolves from a name is called an eponym.    From Wordnik.com.  [Media Newswire] Reference

From Khushi-ilu, the servant of the king, the eponym.    From Wordnik.com.  [The Religion of Babylonia and Assyria] Reference

A successful eponym moves beyond the award-show scene.    From Wordnik.com.  [GOOD] Reference

As much is suggested by the following entry in an eponym list.    From Wordnik.com.  [Myths of Babylonia and Assyria] Reference

Kanye becoming an eponym (a word derived from a person's name).    From Wordnik.com.  [Visual Thesaurus : Online Edition] Reference

As for the booming browser's eponym, it's a bit more local: the.    From Wordnik.com.  [Linux Journal - The Original Magazine of the Linux Community] Reference

The word 'Abram' is merely an eponym -- it means 'exalted father.'.    From Wordnik.com.  [The Damnation of Theron Ware] Reference

At Megara, in Greece, it was the eponym of the city, Megaros, son of.    From Wordnik.com.  [Atlantis : the antediluvian world] Reference

In short, an eponym is anything that's ever been named after anybody.    From Wordnik.com.  [NPR Topics: News] Reference

And so, at last January's American Dialect Society meeting, when the eponym.    From Wordnik.com.  [Visual Thesaurus : Online Edition] Reference

BTW my old eponym needed a change so that's why you the above modification.    From Wordnik.com.  [The Coffee House | Politics and News Discussion Forum] Reference

Yonkers Joe (directed by Robert Celestino) breaks about even with its eponym.    From Wordnik.com.  [Dallas Observer | Complete Issue] Reference

Alessandro Volta, an Italian count and the inspiration for the eponym 'volt,'.    From Wordnik.com.  [SFGate: Entertainment] Reference

The random eponym button is in version 1.8.0 which is now out on the official.    From Wordnik.com.  [The Palmdoc Chronicles] Reference

In fact, there is no issue, I am merely trying to show an example of an eponym.    From Wordnik.com.  [Planet Atheism] Reference

Kanye the eponym has gotten an unexpected shot in the arm from Elinor Burkett's Oscar outburst.    From Wordnik.com.  [Visual Thesaurus : Online Edition] Reference

Thus in the year of Sennacherib’s office as eponym (687.    From Wordnik.com.  [Babylonians and Assyrians, Life and Customs] Reference