Aviator is correct that one meaning of autonym refers to a group of people...
Autonym
1. A word that describes itself; e.g. noun is a noun, polysyllabic is polysyllabic, abbrv. is an abbreviation, word is a word.
2. A person's real name; the opposite of pseudonym.
3. A name by which a social group or race refers to itself.
� From Greek auto (=self).
� Also called self-referential word.
The use of orange in reference to the fruit was indeed in the fourteenth century. The reference to the colour was in the sixteenth.
http://www.randomhouse.com/wotd/index.pperl?da te=19980408
� Take care not to confuse with antonym, autoantonym.