Etymology and distribution of 是広.

Korehiro 【是広】^{レベル3
About 70}  The Japanese surnames etymology dictionary.

Toyama-ken , Shimane-ken , Shiga-ken . Terrain . From island like land and forest. In Toyama-ken Toyama-shi Osaka -fu Oosaka-shi Osaka Castle in Osaka Castle Osaka Castle told that he was renounced from Takeda surname and retired in Shiga-ken 's Matsumoto after falling in 1615 (Keicho 20 years). Shiga-ken 's Matsumoto is a Shiga-ken Ootsu-shi Matsumoto comparative site. 武田 Takeda reference. It was in Shimane-ken Ooda-shi during the Edo period. Shiga-ken Rittou-shi It was in the Edo era at the Rokujou. Tell him that Gunma-ken Maebashi-shi is out there.