The Japanese surnames etymology dictionary.
① Yamanashi-ken Chuuou-shi Originated from Uo in the lower part of the lower figure. Tradition in Chiba-ken Minamibousou-shi . Chiba-ken Minamibousou-shi It was in Okawa Chikura-cho during the Edo period.
② variant of 烏山 . Shimane-ken Yasugi-shi At Hirose-cho Fabu, I tell him that I came from the Kanto region in the Kamakura period and changed Karasuyama as "Utsama" further renamed. There is also a tale of Shiga-ken on the same place. 烏山 reference. Toukyou-to Setagaya-ku Minamitsuyama / Kitakurayama is a place name with a record in 1300 (Tadashi 2 years). Tochigi-ken Nagaiyama told that in 1418 (Years of 25 years) Kosei castle in the castle. The place name was also written as "Cradle Mountain". Shimane-ken Un'nan-shi Kijimachi Temple Ueyama Ueyama is a stopover. It was in Warring States Period in Uyama castle of the same place.
③ Creation . From "Wu" of the Will meaning the period of the Emperor's reign. Tokushima-ken Mima-shi Mima-shi In Mima-cho I tell from 'Uwa' and 'Mountain' of 'Edge of Honorable Mountain' which was called in the era of Emperor Bunmu, the emperor of Asuka period. Tokushima-ken Mima-shi was in the Edo period. 山辺 reference.
⑤ Korea type . Creation . I used woo which is Japanese sound of Yu. There was a record of naturalization on Yamaguchi-ken Shimonoseki-shi on May 1, 1963, July 4, 1974. The real name is Yu. 禹 reference.