Proto-Khoisan : *haka
Meaning : four
Notes : A very interesting isogloss between Khoe and Sandawe, made a little suspicious by the fact that all other numeric parallels between these languages are either highly questionable ('one', 'two') or non-existent. On the other hand, there is no reason to attribute this to contacts between Khoe and Sandawe speakers, which are not documented; at best one could think of a common substrate - but such a substrate has not been found either (the numeral is unknown to any Niger-Congo or Nilo-Saharan speakers).
