demonym (noun)

1. The demonym for someone from Transylvania is Transylvanian, which is often associated with horror stories and vampires.

2. In the movie industry, actors from Hollywood are often referred to as Hollywoodians, which is the demonym for someone from Hollywood.

3. As a joke, someone may refer to a person from McDonald's as a McPerson, using a play on words with the demonym concept.

4. In the world of comics, a character from Gotham City would be referred to as a Gothamite, which is the demonym for someone from Gotham City.