From the Latin vocabulary word meaning ‘king’. This was not used as a personal name in Latin of the classical or Christian periods, and its adoption as a given name seems to have been a 19th-century innovation. Its popularity was increased by the fame of the British actor Rex Harrison (1908–90), who was christened Reginald Carey.
English: topographic name or metonymic occupational name for someone who lived by or worked at a barn or barns, from Middle English barn ‘barn’, ‘granary’. In some cases, it may be a habitational name from Barnes (on the Surrey bank of the Thames in London), which was named in Old English with this word.