Cf. the Hungarian name for the town, Koloszvár, and the German (Transylvanian Saxon) Klausenburg. Alternate forms in older Romanian include Cluș. May be ultimately derived from the Latin word clausa, clusa, from clausus or clusus through an intermediate; cf. the medieval Latin name for the town, Castrum Clus. See also the Slavic word kluč. The official name of the city is Cluj-Napoca, with ancient name Napoca from the Roman era added back to the city's name in 1974, but this form is rarely used outside of official contexts.