Kui (Māori mythology)
Kui was a chthonic demigoddess and the wife of Tuputupuwhenua in Māori mythology. They supposedly live underground and when a new house is built, a tuft of grass is offered to them. Kui is also the name of the father of Vahi-vero and the grandfather of Rata in the Tuamotu islands. References
 

Polynesian goddesses
Māori mythology

Underworld goddesses