Wilhelm Bleek in the context of "Khoisan"

Khoisan (/ˈkɔɪsɑːn/ KOY-sahn) or Khoe-Sān (pronounced [kʰoɪˈsaːn]) is an umbrella term for the various indigenous peoples of Southern Africa who traditionally speak non-Bantu languages, combining the Khoekhoen and the Sān peoples. Khoisan populations traditionally speak click languages. They are considered to be the historical communities throughout Southern Africa, remaining predominant until Bantu and European colonisation. The Khoisan have lived in areas climatically unfavourable to Bantu (sorghum-based) agriculture, from the Cape region to Namibia and Botswana, where Khoekhoe populations of Nama and Damara people are prevalent groups. Considerable mingling with Bantu-speaking groups is evidenced by prevalence of click phonemes in many Southern African Bantu languages, especially Xhosa.

Many Khoesan peoples are the descendants of an early dispersal of anatomically modern humans to Southern Africa before 150,000 years ago. (However, see below for recent work supporting a multi-regional hypothesis that suggests the Khoisan may be a source population for anatomically modern humans.) Their languages show a limited typological similarity, largely confined to the prevalence of click consonants. They are not verifiably derived from a single common proto-language, but are split among at least three separate and unrelated language families (Khoe-Kwadi, Tuu and Kxʼa). It has been suggested that the Khoekhoe may represent Late Stone Age arrivals to Southern Africa, possibly displaced by Bantu expansion reaching the area roughly between 1,500 and 2,000 years ago.