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
Kui (Māori mythology) Wikipedia(Text) CC BY-SA