His posthumous name, 'Shoko-in,' was created by combining "sho," the first character from the name of Emperor Shotoku (the forty-eighth emperor, who was descended from Emperor Tenmu) and "ko," the first character from the name of Emperor Konin (the forty-ninth emperor, who was descended from Emperor Tenji).
追号「称光院」は、天武系の第48代称徳天皇と天智系の第49代光仁天皇の一字づつを取ったものである。