Afroasiatic
The Afroasiatic language family (also called Afrasian or Hamito-Semitic) encompasses approximately 400 languages spoken by around 500 million people across North Africa, the Horn of Africa, the Sahel, West Africa, and the Middle East. Its principal branches are Semitic, Egyptian (extinct), Berber, Cushitic, Chadic, and Omotic. The family's deep time depth — estimates range from 10,000 to 18,000 years — makes it one of the oldest demonstrably related language families on Earth.
The homeland debate remains unresolved. The Northeast African hypothesis, supported by researchers including Christopher Ehret and Igor Diakonoff, places the family's origin in or near the Horn of Africa or the eastern Sahara around 15,000–10,000 BCE, when those regions were wetter and more hospitable during the African Humid Period. The Levantine hypothesis, favoured by some Semitists, proposes an origin in the Near East, with the Afroasiatic family spreading into Africa via early agricultural dispersals. The distribution of the most basal branches (Omotic and Cushitic) in Ethiopia and the Horn of Africa lends support to an African origin.
The Semitic branch achieved its remarkable spread through successive historical expansions: Akkadian became the lingua franca of the ancient Near East by the 3rd millennium BCE; Aramaic replaced it across much of the region by the 1st millennium BCE; and Arabic, carried by the Islamic conquests of the 7th–8th centuries CE, displaced most of the earlier Semitic languages across the Fertile Crescent, Egypt, and North Africa. Ancient Egyptian, attested for over 4,000 years from the 32nd century BCE to the 17th century CE in its Coptic form, represents an entirely separate and extinct branch.
The Chadic branch, with over 150 languages including Hausa (the most widely spoken sub-Saharan African language by native speakers), is distributed across the Lake Chad basin. The Berber languages (collectively called Tamazight) are spoken by Amazigh populations across North Africa, where they represent a pre-Arabic stratum displaced but never fully replaced by the Arab expansion. The Cushitic languages — including Oromo and Somali, among Africa's most widely spoken languages — are distributed across the Horn of Africa and parts of East Africa.