Mars got its name from the Roman god of war. The ancient Romans observed the planet's distinctive red color, which reminded them of blood and battle, making it a fitting symbol for their god of war, Mars. This association with war and the planet's red appearance led to its name. Additionally, the Romans often named celestial bodies after their gods, and Mars' naming follows that tradition. This naming convention also influenced other cultural aspects, such as the month of March (Martius), which is named after the same deity.