Martian

Martian is a term used to refer to anything pertaining to the planet Mars. Martian history, Martian technology, Martian people, Martian settlers, etc. The idea of a people inhabiting the planet Mars is an old one with H.G. Well's 1898 book; War of the Worlds being a notable example. Like the term Earthling it's been used for citizens of a Martian world government in science fiction and for Humans of Earth who are settling the red planet.