Etymology and distribution of 下万.

Shimoman 【下万】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Hiroshima-ken Aki-gun Kaita-chou . Heterogeneity of 高河原 . Hiroshima-ken Hiroshima-shi Naka-ku Kamamachi was in the Edo period in the Hiroshima samurai of the Clan office. The same clan says that he changed his name from Takagawara surname in the Edo period. 高河原 Takagahara reference.