From Halopedia, the Halo wiki
Padpad, along with Buwan, is one of the two natural satellites orbiting the Unggoy homeworld of Balaho. Located in the Tala system, Padpad orbits Balaho as the planet's secondary satellite. Along with Buwan, Padpad was stripped of its resources by the Covenant's tithe fleets, the moons hollowed out to feed the assembly forges of the Holy City of High Charity.
In Tagalog, "Padpad" means "Blown by the Wind" or "Gone with the Wind".