Ethnic Group Kisii Demographic and Health Surveys Program (2015) Gusii Request inclusion into relevant ontology, possibly below "Ethnic Group" in NCIT? The Kisii tribe (also known as the Gusii tribe) is a Bantu ethnic group who occupy the Kisii highlands in Nyanza, Western Kenya. The Kisiis constitute the sixth largest ethnic group, comprising about seven percent of the national population. Kisii, which is their ethnic language, is also traditionally known as Ekegusii. Kisii Ethnic Group Few but definitions not specific enough