Kumasu 【久萬壽】1 The Japanese surnames etymology dictionary.
① Fukuoka-ken Iidzuka-shi Originated from the vicinity of the tail (Old: Oya). A place name with a record since the Kamakura period. The place name was also written as "Otani". It was in the Muromachi period in the same place. Ooita-ken Hayami-gun Hiji-machi (others) was in the Edo era in the Sunrise clan of the clan office.