Etymology and distribution of 東長.

Tounaga 【東長】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Toukyou-to . The majority is the stage name of Japanese dance. Hanayanagi is derived from Nishikawa flow in 1849 (Yoshinaga 2).

※ Korean type . There is a record of naturalization on Ehime-ken Saijou-shi (formerly: Miyoshi-machi, Sugawara-gun) on April 28, 1962. The real name is white. 白 Haku reference.