<P> The Czech Republic's official formal and short names at the United Nations are Česká republika and Česko in Czech, and the Czech Republic and Czechia in English . All these names derive from the name of the Czechs, the West Slavic ethnic group native to the Czech lands . Czechia (/ ˈtʃɛkiə /), the official English short name specified by the Czech government, is used by many international organisations and attested as early as 1841 . However, most English speakers use (the) Czech Republic in all contexts . Other languages generally have greater official use of a short form analogous to Česko or Czechia (such as French (la) Tchéquie or Korean 체코 / Cheko) although forms equivalent to "Czech Republic" are not uncommon . </P> <P> The Czech name Čechy is from the same root but means Bohemia, the westernmost and largest historical region of the Czech lands and the modern Czech Republic . The name Bohemia is an exonym derived from the Boii, a Celtic tribe inhabiting the area before the early Slavs arrived . The Lands of the Bohemian Crown (1348--1918) were part of the Holy Roman Empire; often called "the Czech lands", they sometimes extended further, to all of Silesia, Lusatia, and various smaller territories . The Czech adjective český means both "Czech" and "Bohemian". </P> <P> The Czech Republic's official formal and short names in Czech were decided at its creation after the dissolution of Czechoslovakia in the so - called "Velvet Divorce" of 1993 . </P> <P> The country is named after the Czechs (Czech: Čechové), a Slavic tribe residing in central Bohemia that subdued the surrounding tribes in the late 9th century and created the Czech / Bohemian state . The origin of the name of the tribe itself is unknown . According to legend, it comes from their leader Čech, who brought them to Bohemia . Research regards Čech as a derivative of the root čel - (member of the people, kinsman). </P>

When did the czech republic change its name