Hello there
As i know, the cumans came from East Turkestan. There was a separate tribe among them called sari uyghurs, polovec in slavic, what we hungarians adopted, and called them palóc. They had brighter, yellowish hair, because of the mixing with the indoeuropean tokhars, who lived in the Tarim Basin long ago. Saris, and other kumans settled in Hungary in the XIII. century, and they live in the regions Cumania and Palócland. They spoke a northwestern common turkish language (as the tatar, bashkir, kazakh, kyrgyz, nogaj), but it died out (in 1770 in Hungary). Kumans were (are) turkic type peoples, just as their nearest genetical and cultural relatives, the uyghurs. Turkic peoples are a transition from the mongolian to the pure turkish types, and all of them are turkic - for an example some uyghurs look like mongolians, others like turks from Samarqand or Anatolia..
In Hungary there is a huge mixture of asian steppe peoples such as the cumans, sari-uyghurs, pechenegs, avars, jazygs (which are indo-iranian), khazars, osman-turks, and of course hungarians, who are descendants of the black huns. For me, i have cuman, avaric and jazyg heritage too, with noble hunnic progeny dated from the VIII. century.
/Sorry for my bad english/