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Chichewa / Chinyanja
Chewa, also known as Nyanja, is a language of the Bantu language family. The noun class prefix chi- is used for languages, so the language is also called Chichewa and Chinyanja (spelled 'Cinyanja' in Zambia, and 'Cinianja' in Mozambique). It is spoken in Zambia, Mozambique, Malawi and Zimbabwe.
In Malawi, the name was officially changed from Chinyanja to Chichewa in 1968 at the insistence of President Hastings Kamuzu Banda (himself of the Chewa tribe), and this is still the name most commonly used in Malawi today.