Etymology and distribution of 広洞.

Hirobora 【広洞】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Hiroshima-ken , Okayama-ken , Shizuoka-ken .

① Mr. Sojuu surname, 藤原 surname. Hiroshima-ken Hiroshima-shi Naka-ku Kamamachi was in the Edo period in the Hiroshima samurai of the Clan office. 宗岡 Muneoka reference. 藤原 Fujiwara reference.

② Personal name . Chiba-ken Noda-shi Meiji New surname by monk at Poemon Temple in Soto sect in Shimanekao. In the same temple tells that he used "sect of religion" of sect of religion from Yukari with Mr. Chosa Mune, who is a warrior of the Kamakura period. 千葉 Chiba reference.