Etymology and distribution of 五郎.

Gorou 【五郎】^{レベル3
About 50}  The Japanese surnames etymology dictionary.

Saitama-ken Saitama-shi Minakun-ku, Saitama-ken Saitama-shi Iwatsuki-ku. Origin of Saitama-ken Souka-shi Benten (old: Shinoha ). A place name with a record since the Edo period. Saitama-ken Saitama-shi It was in the Edo period in Iwashiti-ku Iwasaki-ku.

※ Shizuoka-ken Suntou-gun Oyama-chou there was a case that Mr. Ayuzawa's descendant called in the Kamakura period. 鮎沢 Ayuzawa reference.