From Daily Writing Tips:
The person for whom something is named: chauvinism, Caesarian Section, boycott.
A name for a people used by outsiders and not by the people themselves. For example, English-speakers call the people of Wales the Welsh.
A name by which a people refers to itself. The name the Welsh people call call themselves is Cymry. They call their country Cymru. Switzerland, which has four official languages, each of which has a different word for Switzerland–Suisse, Schweiz, Svizzera, Svizra—uses the Latin word Helvetica for the country on its postage stamps and for other uses. Here are some more country autonyms with their English exonyms:
The name of an ethnic group, tribe, or people. The residents of the United States are called Americans. Other ethnonyms used by Americans include African-American, Black, Indian, Native American, and Asian-American. A similar term, demonym, is a term that refers to the inhabitants of a place. For example, Chicagoans, Londoners, Mancunians (inhabitants of Manchester, England).
The name of a place. Because the Romans occupied Britain for three and a half centuries, many British place names derive from Latin words. For example, the Romans called their camps castra, a word that developed into the suffix chester/cester, giving modern Manchester, Winchester, and Cirencester.
“An erroneous name.” The Greek word for bad, kako, gives us several English words. Cacophony is “bad sound,” for example from an untuned musical instrument, or harsh- sounding words. A cacodemon is an evil spirit. A caconym is a “bad name,” i.e., an incorrect or faulty term. A malapropism, for example, is a caconym.
Link to the rest at Daily Writing Tips