Chechens
Chechens (; '; Old Chechen: Нахчой "Naxçoy") are a Northeast Caucasian ethnic group of the Nakh peoples originating in the North Caucasus region of Eastern Europe. They refer to themselves as Vainakhs (which means "our people" in Chechen) or Nokhchiy (pronounced ; singular Nokhchi, Nakhchuo or Nakhtche). Chechen and Ingush peoples are collectively known as the Vainakh. The majority of Chechens today live in the Chechen Republic, a subdivision of the Russian Federation.
Czechs
Ethnic Czechs were called Bohemians in English until the early 20th century, referring to the medieval land of Bohemia which in turn was adapted from late Iron Age tribe of Celtic Boii. During the Migration Period, West Slavic tribes of Bohemians settled in the area, "assimilated the remaining Celtic and Germanic populations", and formed a principality in the 9th century, which was part of Great Moravia, in form of Duchy of Bohemia and later Kingdom of Bohemia, the predecessors of the modern republic.