Etymology and distribution of 岩広.

Iwahiro 【岩広】^{レベル3
About 110}  The Japanese surnames etymology dictionary.

Toukyou-to , Chiba-ken , Saitama-ken .

① Toukyou-to Shibuya-ku Origin of Udagawa-cho. As the town name was the place name established in 1928. The place name was from Udagawa who was flowing in the same place. Toukyou-to Shinagawa-ku It was in the Muromachi period in the Kitashinagawa river . Toukyou-to Minato-ku Higashi Shinbashi neighborhood (formerly Shiba Udagawa) is a via point. A place name with a record since the Edo period. Tell the place name from Mr. Udagawa's name.

② Originated from Udagawa (Old: Udagawa) flowing in Yodoe-cho, Tottori-ken Yonago-shi . In the Heian period the name of the place with the notation of "Utagawa" recorded.

③ Heteromorphism of 宇陀川 .