[3] A root for 'louse' shared by some Khoe and Tuu languages (ǁxóni~kx'uni~kx'uri) has been suggested as deriving from a 'pre-Tuu/pre-Khoe substrate'.

This is generally thought to be due to thousands of years of contact and mutual influence (a sprachbund), but some scholars believe that the two families may eventually prove to be related.

The term "Vaal–Orange" was once used for ǂUngkue (formerly spoken at the confluence of the Vaal and Orange Rivers) combined with several of the Eastern lects, which have since been separated.

Westphal studied a Taa variety variously rendered ǀŋamani, ǀnamani, Ngǀamani, ǀŋamasa.

Bleek recorded another now-extinct variety, which she labeled 'S5', in the town of Khakhea; it is known in the literature as Kakia.