The Kikuyu tribe, which originally belongs to the Bantu group is said to have been founded by a man called Gikuyu. Kikuyu history says that the Kikuyu God, Ngai, took Gikuyu to the top of Kirinyaga and told him to stay and build his home there.
He was also given his wife, Mumbi. Together, Mumbi and Gikuyu had nine daughters. There was actually a tenth daughter but the Kikuyu considered it to be bad luck to say the number ten. When counting they used to say "full nine" instead of ten.
It was from the nine daughters that the nine (occasionally a tenth) Kikuyu clans -Achera, Agachiku, Airimu, Ambui, Angare, Anjiru, Angui, Aithaga, and Aitherandu- were formed. Kikuyu tribes are traditionally farmers and their homelands are good farmlands in Kenya.