Swahili language
The exact number of Swahili speakers, be it native or second-language speakers, is unknown and a matter of debate. Various estimates have been put forward and they vary widely, from 50 million to over 100 million. Swahili serves as a national language of four nations: Tanzania, Kenya, Uganda, and the DRC. Shikomor, the official language in Comoros and also spoken in Mayotte (), is related to Swahili. Swahili is also one of the working languages of the African Union and officially recognised as a lingua franca of the East African Community. South Africa legalized the teaching of Swahili in South African schools as an optional subject beginning in 2020.
Gbe languages
Estimates of the total number of speakers of Gbe languages vary considerably. Capo (1988) gives a modest estimate of four million, while SIL's Ethnologue (15th edition, 2005) gives eight million. The most widely spoken Gbe languages are Ewe (Ghana and Togo) and Fon (Benin, eastern Togo) at four million and 3 million speakers, respectively. Ewe is a language of formal education for secondary schools and universities in Ghana, and is also used in non-formal education in Togo. In Benin, Aja (740,000 speakers) and Fon were two of the six national languages selected by the government for adult education in 1992.