Sino-Caucasian is the name of a putative linguistic “superfamily” that is assumed to have been descended from a single proto-language of remote antiquity. This superfamily groups Sino-Tibetan (and, consequently, Chinese) languages together with several other linguistic families of Eurasia, most notably, North Caucasian, represented by two branches, Northeast and North­west Caucasian, the genetic relationship between which is not universally accepted (Pereltsvaig 2013:64), and Yeniseian (a small …