Chechens
In 1989, 73.4% spoke Russian, though this figure has declined due to the wars for a large number of reasons (including the lack of proper education, the refusal to learn the language, and the mass dispersal of the Chechen diaspora due to the war). Chechens in the diaspora often speak the language of the country they live in (English, German, Arabic, Polish, Georgian, etc.).
Pechenegs
Mahmud al-Kashgari, an 11th-century man of letters specialized in Turkic dialects argued that the language spoken by the Pechenegs was a variant of the Cuman and Oghuz idioms. He suggested that foreign influences on the Pechenegs gave rise to phonetical differences between their tongue and the idiom spoken by other Turkic peoples. Anna Komnene likewise stated that the Pechenegs and the Cumans shared a common language. Although the Pecheneg language itself died out centuries ago, the names of the Pecheneg "provinces" recorded by Constantine Porphyrogenitus prove that the Pechenegs spoke a Turkic language. The Huns, Khazars and Pechenegs are thought to have belonged to the same proto-Turkic group of languages as the modern Chuvash language (Oghur dialects).