Etymology and distribution of 弦.

Tsuru 【弦】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Ibaraki-ken Sakuragawa-shi , Oosaka-fu · Hokkaidou .

① Ibaraki-ken Sakuragawa-shi It is based in Inaba.

② Topography . There was a case that Osaka-fu changed from a sanitary name. Estimated in around 1950. 信 Nobu reference.