An ethnonym (from the Greek: ἔθνος, éthnos, "nation" and ὄνομα, ónoma, "name") is the name applied to a given ethnic group. Ethnonyms can be divided into two categories: exonyms (where the name of the ethnic group has been created by another group of people) and autonyms or endonyms (self-designation; where the name is created and used by the ethnic group itself).
As an example, the ethnonym for the ethnically dominant group in Germany is the Germans. This ethnonym is an exonym used by the English-speaking world, although the term itself is derived from Latin. Conversely, Germans themselves use the autonym of die Deutschen. Germans are indicated by exonyms in many European languages, such as Italian (tedeschi), French (Allemands), Spanish (alemanes) and Polish (niemcy).
Numerous ethnonyms can apply to the same ethnic or racial group, with various levels of recognition, acceptance and use. The State Library of South Australia contemplated this issue when considering Library of Congress Headings for literature pertaining to Aboriginal and Torres Strait Islander people. Some 20 different ethnonyms were considered as potential Library of Congress headings, but it was recommended that only a fraction of them be employed for the purposes of cataloguing.
Change over time 
Ethnonyms can change in character over time; while originally socially acceptable, they may come to be considered offensive. For instance, the term Gypsy has been used to refer to the Roma. Other examples include Vandal, Bushman, Barbarian, and Philistine.
The ethnonyms applied to African Americans have demonstrated a greater evolution; older terms such as colored carried negative connotations and have been replaced by modern-day equivalents such as black or African-American. Other ethnonyms such as Negro have a different status. The term was considered acceptable in its use by activists such as Martin Luther King in the 1960s, but other activists took a different perspective. In discussing an address in 1960 by Elijah Muhammad, it was stated "to the Muslims, terms like Negro and colored are labels created by white people to negate the past greatness of the black race".
Four decades later, a similar difference of opinion remains. In 2006, one commentator suggested that the term Negro is outdated or offensive in many quarters, although its use remains in organisations such as the United Negro College Fund; similarly, the word "colored" still appears in the name of the NAACP, or National Association for the Advancement of Colored People.
In this context, an ethnonym has the potential to mimic the phenomenon of the euphemism treadmill.
In English, ethnonyms are generally formulated through suffixation; by applying an -n to people of Austria, their nationality is known as Austrian. In English, in many cases, the word for the dominant language of a group is identical to their English-language ethnonym; the French speak French, the Germans speak German. This is sometimes erroneously overgeneralized; it may be assumed that people from India speak "Indian", despite there being no language which is called by that name.
Generally, any group of people may have numerous ethnonyms associated with the political affiliation with a state or a province, with geographical landmark, with the language, or another distinct feature. Ethnonym may be a compound word releted to origin or usage, polito-ethnonym indicates that name originated from the political affiliation, like Belgian for inhabitants of Belgium that have their own endonyms; topo-ethnonym refers to the ethnonym derived from the name of the locality, like Uralians for the inhabitants of the geographical area near the Ural mountains that have their own distinct endonyms. Classical geographers frequently used topo-ethnonyms (demonyms) as substitute for ethnonyms in general descriptions or for unknown endonyms. Compound teminology is widely used in professional literature to discriminate semantics of the terms.
See also 
- Aboriginal Rountable (1995): LCSH for ATSI People.
- [dead link]
- "The Papers of Martin Luther King, Jr.: Volume V: Threshold of a New Decade ... - Martin Luther King Jr. - Google Boeken". Books.google.com. Retrieved 2012-08-15.
- Message from the Wilderness of North America. A Journal for MultiMedia History article.
- Mrs. Bush's Remarks at United Negro College Fund Anniversary.
- "Teaching and Learning in the Primary School - Andrew Pollard - Google Boeken". Books.google.com. Retrieved 2012-08-15.