The Abagusii is an East African ethnic group with diverse origins with the majority of the population originating from the pre-existing Neolithic Agropastoralist and hunter/gatherer inhabitants of present-day Kenya particularly former Nyanza and Rift Valley provinces of Kenya. These Neolithic Agropastoralists were of the same stock as the ancestors of the modern Nilotes, Omotics and Cushites as well as the ancient East African hunter/gatherers similar to Ogiek that settled in Kenya during the Savanna Pastoral Neolithic period and were the original progenitors of the majority of the modern Abagusii people. However, some of the Abagusii are believed to have been assimilated from the Luhya and Olusuba speaking Suba people that are believed to have migrated from the West of Lake Victoria that is present-day Buganda and Busoga in 1800s hence originally from Central Africa/West Africa by the way of Bantu expansion. The majority of Abagusii are closely related to the Maasai, Kipsigis, Abakuria, and Ameru of Kenya. They also have close linguistic relationship with Ngurimi, Rangi, Mbugwe, Simbiti, Zanaki and Ikoma people.