Languages of Catalonia
The main cause of Spanish and Catalan social bilingualism in modern Catalonia was large-scale migration from the rest of Spain during the 20th century, as Catalonia started a significant industrialization which demanded an increased workforce from elsewhere. Spanish has historically been spoken among a minority of civil servants born in other regions in Spain and among segments of the wealthiest bourgeoisie. Spanish has also been spoken as a second language by most Catalans, as it has been the only official language over long periods since the eighteenth century.
Catalan language
The word "Catalan" is derived from the territorial name of Catalonia, itself of disputed etymology. The main theory suggests that (Latin "Gathia Launia") derives from the name "Gothia" or "Gauthia" ("Land of the Goths"), since the origins of the Catalan counts, lords and people were found in the March of Gothia, whence "Gothland" > "Gothlandia" > "Gothalania" > "Catalonia" theoretically derived.