Etymology and distribution of 甘艸.

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

Nagano-ken Okaya-shi , Yamanashi-ken . Distribution including Aizawa as well.

① Nagano-ken Okaya-shi Originated from Ayase in the lower shore of the river. Tradition on the same place.

② variant of 合沢 . 合沢 Aizawa reference.

③ Yamanashi-ken Minamiarupusu-shi Birth of Ayukawa. A place name with a record since the Kamakura period. The place name was also written as "Aizawa" and "Aizawa".

④ Gifu-ken Nakatsugawa-shi Originated from the Aizawa (Aizawa) of Sakashita's underwear. Nagano-ken Kiso-gun Nagiso-machi Tradition in reading books .