Question: is asuna a real name?
Answer: Asuna Yuuki (結城 明日奈, Yūki Asuna) is a fictional character who appears in the Sword Art Online series of light novels by Reki Kawahara. She is mononymously more commonly known as just Asuna (アスナ, Asuna), her player name in the eponymous video game which the novels are set in.