Elamite language
The Sumerian and Etruscan languages, usually regarded as language isolates, are thought by some to be Nostratic languages as well. Others, however, consider one or both to be members of another macrofamily called Dené–Caucasian. Another notional isolate, the Elamite language, also figures in a number of Nostratic classifications. It is frequently grouped with Dravidian as Elamo-Dravidian.