The Japanese surnames etymology dictionary.
② Ooita-ken Ooita-shi Origin of tree (keno). A place name with a record since the Edo period. Kagoshima-ken was in the Warring States Period. In the same place, tell Ooita-ken as the descendant of Mr. Otomo who used as base the Kamakura period and the Muromachi period. Pronunciation is Keno.
③ things . From the tree. Wakayama-ken Ito-gun Konoye is in Kudoyama-chou . In the same place, Emperor Shirakawa, the emperor of the Heian era, tells him that he sat on the split tree at home when he went to Koyasan in Wakayama-ken Ito-gun Kouya-chou . Estimated in 1088 (Kanji 2 years).