The Japanese surnames etymology dictionary.
① Topography . From the red swamp. Okayama-ken Kurashiki-shi Tamashima Oshima is based. Okayama-ken Okayama-shi Kita-ku Okayama Samurai in the Edo period in the Edo period, Ehime-ken Seiyo-shi Uwa cho Meiwa, Shiga-ken Konan-shi stone section, Gunma-ken Takasaki-shi Minoucho cho Higashi- It was in the Warring States Period as the vassal of Mr. Nagano who was the castle owner of Minowa castle.
② Shizuoka-ken Itou-shi Origin of Akazawa. A place name with a record since the Warring States Period. Shizuoka-ken Shizuoka-shi Aoi-ku Akazawa is a stopover. A place name with a record since the Edo period. Tell the place name that Mr. Akazawa stayed.