Etymology and distribution of 湏藤.

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

Ibaraki-ken , Oosaka-fu , Toukyou-to .

① Origin of Ibaraki-ken Kashima-shi Tsuga. A place name with a record since the Edo period.

② Mie-ken Suzuka-shi Origin of Tsuga-cho. A place name with a record since the Warring States Period. The place name was also written as "Tsumara". Meiji New surname by monk of Jodoji temple of Jodo Shinshu located in the same place. The mountain of the temple is Tsuga mountain.