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.
Nahuatl
According to the 2000 census by INEGI, Nahuatl is spoken by an estimated 1.45 million people, some 198,000 (14.9%) of whom are monolingual. There are many more female than male monolinguals, and women represent nearly two thirds of the total number. The states of Guerrero and Hidalgo have the highest rates of monolingual Nahuatl speakers relative to the total Nahuatl speaking population, at 24.2% and 22.6%, respectively. For most other states the percentage of monolinguals among the speakers is less than 5%. This means that in most states more than 95% of the Nahuatl speaking population are bilingual in Spanish.