demonym
Pronunciation:
/ˈdɛmənɪm/noun
Definitions
A name for an inhabitant or native of a specific place, usually derived from the name of the place.
Example: Why is it that people from the United States use American as their demonym?
A pseudonym formed of an adjective.
Example: The Logophile has my favourite demonym; I would write under it if he didn't.