|South central Nigeria, lower reaches of the Niger River and east, south the Benue|
Igboid languages constitute a branch of the Volta–Niger language family. It includes Ukwuani, and the Igbo languages
Williamson and Blench conclude that the Igbo languages (Igboid apart from Ekpeye) form a "language cluster" and that they are somewhat mutually intelligible. However, mutual intelligibility is only marginal, even among the Izii–Ikwo–Ezaa–Mgbo languages.
Names and locations
Below is a list of language names, populations, and locations from Blench (2019).
|Language||Cluster||Dialects||Alternate spellings||Own name for language||Endonym(s)||Other names (location-based)||Other names for language||Exonym(s)||Speakers||Location(s)|
|Ịka||Agbor (standard form); southern and eastern varieties are more similar to Igbo||Ìḳá||Agbor||Delta State, Ika and Orhionmwon LGAs|
|Ikwere||Northern dialects: Elele, Apanị, Ọmerelu, Ubima, Isiokpo, Ọmagwna (Ọmuegwna), Ipo, Ọmudioga, Ọmuanwa, Igwuruta, Egbedna, Alụu, Ịbaa; Southern dialects: Akpọ–Mgbu–Tolu, Ọbio, Ọgbakiri, Rụmuji, Ndele, Emọhua||Ikwerre||Ìwhnuruò`hnà||54,600 (1950 F&J); possibly 200,000 (SIL)||Rivers State, Ikwerre, Port Harcourt and Obio–Akpor LGAs|
|Izii–Ẹzaa–Ikwo–Mgbo cluster||Izii–Ẹzaa–Ikwo–Mgbo||593,000 (1973 SIL)|
|Izi||Izii–Ẹzaa–Ikwo–Mgbo||Ezzi, Izzi||84,000 (1950 F&J); 200,000 (1973 SIL)||Anambra State, Abakaliki and Ishielu LGAs; Benue State, Okpokwu LGA|
|Ẹzaa||Izii–Ẹzaa–Ikwo–Mgbo||Eza||93,800 (1950 F&J); 180,000 (1973 SIL)||Anambra State, Ezza and Ishielu LGAs; Abia State, Ohaozara LGA; Benue State, Okpokwu LGA|
|Ikwo||Izii–Ẹzaa–Ikwo–Mgbo||38,500 (1950 F&J); 150,000 (1973 SIL)||Anambra State, Ikwo and Abakaliki LGAs|
|Mgbo||Izii–Ẹzaa–Ikwo–Mgbo||Ngbo||19,600 (1950 F&J); 63,000 (1973 SIL)||Anambra State, Ishielu LGA|
|Ogbah||Egnih (East Ogbah), South Ogbah, West Ogbah||Ogba||22,750 (1950 F&J)||Rivers State, Ahoada LGA|
|Ẹkpẹyẹ||According to clan names: Ako, Upata, Ubye, Igbuduya||Ekpeye, Ekpabya (by Abua), Ekkpahia, Ekpaffia||20,000 (1953); 50,000 (1969 Clark)||Rivers State, Ahoada LGA|
|Ụkwuanị–Aboh–Ndọnị cluster||Ụkwuanị–Aboh–Ndọnị||150,000 (SIL)||Delta State, Ndokwa LGA; Rivers State, Ahoada LGA|
|Ụkwuanị||Ụkwuanị–Aboh–Ndọnị||Utaaba, Emu, Abbi, Obiaruku||Ukwani, Ukwali, Kwale||Delta State, Ndokwa LGA|
|Aboh||Ụkwuanị–Aboh–Ndọnị||Eboh||Delta State, Ndokwa LGA|
|Ndọnị||Ụkwuanị–Aboh–Ndọnị||Rivers State, Ahoada LGA|
- List of Proto-Igboid reconstructions (Wiktionary)
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Igboid". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- Williamson, Kay; Roger M. Blench (2000). African languages: an introduction. Cambridge University Press.
- Blench, Roger (2019). An Atlas of Nigerian Languages (4th ed.). Cambridge: Kay Williamson Educational Foundation.
- Forde, C.D. and G.I. Jones 1950. The Ibo and Ibibio speaking peoples of Southern Nigeria. Ethnographic Survey of Africa. Western Africa part III. International African Institute, London.
- Clark, David J. 1969. A grammatical study of Ekpeye. University of London doctoral dissertation.
- Blench, Roger. 2016. A reconstruction of the phonology of proto-Igboid.