Our red neighbor Mars has two moons called Phobos and Deimos. They are very small - Phobos is 22 km and Deimos is 12.6 km in diameter and they are believed to be captured asteroids.

Per wiki:

"Both satellites were discovered in 1877 by Asaph Hall, and are named after the characters Phobos (panic/fear) and Deimos (terror/dread) who, in Greek mythology, accompanied their father Ares, god of war, into battle. Ares was known as Mars to the Romans."

Further reading is available at wiki.
Source(s):
http://en.wikipedia.org/wiki/Moons_of_Mars

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