In 1793, Kodayu DAIKOKUYA, who had drifted and stayed in Russia, returned to Japan and told that during staying in Russia he had heard the names of Junan NAKAGAWA and Hoshu KATSURAGAWA.
寛政5年（1793年）、ロシアから大黒屋光太夫が帰還したとき、光太夫はロシアで聞いた日本人の名として中川淳庵・桂川甫周の名を挙げている。