He argued that Shinsei SEI might have been given the surname which has similar sound of a word meaning earnest and honest in Chinese by Emperor, but he said that his Japanese name was unknown.
中国の言葉でまじめでまっすぐな人柄を指すときに使う言葉の音に似た姓名を皇帝より下賜されたのではないかと主張し、日本名に関しては不明と主張。