Haumea is the dwarf planet whose two known moons are named Hiʻiaka and Namaka.
Hiʻiaka is Haumea’s larger outer moon, while Namaka is the smaller inner moon. Both names come from Hawaiian mythology: Hiʻiaka and Namaka are traditionally described as daughters of the goddess Haumea. The names were officially adopted in 2008.
Haumea is one of the recognized dwarf planets beyond Neptune. It is especially distinctive because it spins extremely rapidly, completing one rotation in about four hours. That fast rotation stretches Haumea into an elongated, oval shape rather than a nearly spherical body.
Haumea also has a ring, discovered in 2017, making it the first known trans-Neptunian dwarf planet with one. Ceres is the largest object in the asteroid belt, Eris is a distant massive dwarf planet, and Makemake has two provisional moons—but none has the Hiʻiaka–Namaka pair.