Nereid

Overview
Nereid is the 2nd largest moon of Neptune.

About this moon
Nereid along with Triton are the largest of Neptune's moons. Nereid's orbit could suggest of being a Kuiper Belt Object. But also it could have been from Triton's capture.

Facts

 * Nereid is the second moon that has more than one thing. The first one is Titan. In greek mythology, nereids are sea creatures and titans are giants, I guess.
 * It is the only other moon with an odd orbit. There could be other moons though.