Etymology and distribution of 瀬永.

Senaga 【瀬永】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Fukuoka-ken . Ooita-ken Usa-shi Birthplace of Hosokai-machi Tsunamata (Tsukino-mata) birthplace. A place name with a record since the Edo period. The place name was also written as "moon crotch". Fukuoka-ken Asakura-shi Tradition in the upper autumn moon. Fukuoka-ken Asakura-shi In a tree I say that the place name was renamed from the monthly tournament last name in 1579 (Tensho 7) at the moon crotch. It is unknown whether the moon crotch will exist.