Etymology and distribution of 鰯.

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

Yamaguchi-ken . Variant of 歌田 . Tradition in Shimane-ken western part (formerly Iwami-kuni).

* In Hiroshima-ken western part (formerly Aki country), descendants of Takashi Takashi who is a warrior of the Kamakura period and the North-South morning period in the North-South morning era called from the place name of Utada near Hiroshima-ken Akitakata-shi (formerly Takada gun) To tell. Location unknown. 高 Kou reference.

※ There is a record in Hyogo-ken Northern area (formerly Tajima Country) in 1285 (Hiroshi 8 years).