Etymology and distribution of 棹.

Sao 【棹】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Nagano-ken , Toukyou-to , Kagoshima-ken .

① Nagano-ken Kiso-gun Kiso-machi Originated from Ueta Island of Suekawa Onohara, Kaeda Kogen. Tell him that in the same place in 1576 (Tensho 4 years). Nagano-ken Kiso-gun Kiso-machi Handed down in Furuyasiki of Sendagawa Kota Kogen.

② Topography . From the island like the land below.

③ Topography . A rename whose Shino 's roof was "down". Shizuoka-ken Shimada-shi In Shido - li, let's say that Shinojima surname has become Shimosima surname. Estimated in the Edo period. 篠島 Shinojima reference.