The non-Khoisan languages Xhosa and Zulu (30 million+ speakers in South Africa, now far greater than the Khoisan languages) also have clicks, but in smaller num

The non-Khoisan languages Xhosa and Zulu (30 million+ speakers in South Africa, now far greater than the Khoisan languages) also have clicks, but in smaller numbers. One of the UCT Linguistics professors had a theory that the clicks that infiltrated Xhosa and Zulu (and not other languages) were due to a tradition in which engaged women had to avoid saying the letters in the names of their fiance's male relatives. Clicks from neighbouring Khoisan populations entered the languages as a strategy to help much more recently than the split this article is talking about.