El Principito, in standard Spanish.
El Petit Príncep – in Catalan, a language spoken by a Latin ethnic group formed by the people from, or with origins in, Catalonia or the Catalan countries, who also form a nationality in northeastern Spain.
El Príncep Xiquet — in Valencian, which is a dialect of Catalan spoken in the Valencian Community, Spain.
El Chicotet Príncip — in El Puig spelling of Valencian language.
Er Principico, in Murcian dialect, which is one of the southern dialects of Spanish and tends to eliminate many syllable-final consonants and to emphasize regional vocabulary, much of which is derived from Aragonese, Catalan and Arabic words.
O Prenzipet — in Aragonese, a Romance language spoken in several dialects by 10,000 to 30,000 people in the Pyrenees valleys of Aragon, Spain, primarily in the comarcas of Somontano de Barbastro, Jacetania, Alto Gállego, Sobrarbe, and Ribagorza/Ribagorça. It is the only modern language which survived from medieval Navarro-Aragonese in a form distinctly different from Spanish.
O Principiño, in Galician. Galician is an Indo-European language of the Western Ibero-Romance branch. It is spoken in Galicia, an autonomous community located in northwestern Spain, where it is official along with Spanish. Modern Galician and its sibling, Portuguese, originated from a common medieval ancestor designated variously by modern linguists as Galician-Portuguese.
O Principiño – also in Galician.
El Prencipicu — in Leonese, a Romance dialects currently spoken in northern and western portions of the historical region of León in Spain (the modern provinces of León, Zamora, and Salamanca) and a few adjoining areas in Portugal. In this narrow sense, Leonese is distinct from the dialects grouped under Asturian, although there is no clear linguistic division. In the past, it was spoken in a wider area, including most of the historical region. The current number of Leonese speakers is estimated at 20,000 to 50,000.
Er Prinzipito, in Spanish Andaluz, which is a dialect spoken in Andalusia, Ceuta, Melilla, and Gibraltar. They include perhaps the most distinct of the southern variants of peninsular Spanish, differing in many respects from northern varieties, and also from Standard Spanish.
El Principinu — in Extremaduran language, a vernacular Romance dialects of the Asturleonese language spoken in Extremadura and adjoining areas in the province of Salamanca. I got this book directly from the translator, Antoniu Garrido Correas. Honestly, previously I know nothing about Extremadura. Then I realised that this area, together with Portugal, used to be the historical region of Lusitania.