At that time, there was a practice of using witty expressions for official position names (for example, using 'Komon' for 'Chunagon' (vice-councilor of state)), and since the position of Nakatsukasa-shoyu (Junior Assistant Minister of the Ministry of Central Affairs) was called 'Chushosho,' WAKIZAKA was called 'Mr. Chujo.'
当時「官名」を中国風にしゃれて呼ぶ慣わしがあり（「中納言」を「黄門」と呼んだのがその一例）、中務少輔の職が「中書省」であったことから、脇坂は「中書（ちゅうじょう）さま」と呼ばれていた。