Proto-Khoisan : *cqa-
Meaning : two
Notes : Possible development in Sandawe: kiso- < *kso- < *cko-? The parallel is somewhat forced, but the ultimate solution depends on perfection of the intermediate reconstructions. On a weird sidenote, cf. S. Starostin's reconstruction for Proto-Sino-Caucasian: *(t)xq̇wV̄ 'two'. Old "global root"?