Martian

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late Middle English (in the senses ‘subject to Mars's influence’ and ‘martial’): from Latin Mars, Mart- (see Mars) + -ian.

wiktionary

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From Latin Mārtius(“of or relating to the planet Mars”) +‎ -an(adjective-forming suffix). [1] The word is cognate with Middle English marcien, marcyan, mercien(“subject to the influence or power of the planet Mars; relating to the god Mars, that is, warlike”), [2]Middle French martien(“Martian”) (modern French martien), [1]French Martien(“imaginary inhabitant of Mars; any extraterrestrial”), Italian marziano, Latin Mārtiānus(“Martian”), Portuguese marciano, Spanish marciano.

etymonline

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Martian (adj.)

late 14c., marcien "of, pertaining to, or characteristic of the planet Mars" (originally in reference to astrological influence), from Latin Martius "sacred to (the god) Mars; pertaining to (the planet) Mars," from Mars (genitive Martis; see Mars). From mid-15c. as "of or pertaining to the god Mars, warlike;" also sometimes "of or pertaining to the month of March" (1620s). The noun meaning "an inhabitant of the planet Mars" is attested by 1877.