He gave the name of Senryu V to Namagusai-Tazukuri (Kinzo MIZUTANI), a fish wholesaler in Tsukuda-jima Island, and he called himself 'Ryuo' (literally, the venerable old willow).
佃島の魚問屋・腥斎佃（水谷金蔵）に五世川柳を譲り、自らは「柳翁」となった。