Etymology and distribution of 河源.

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

Shizuoka-ken Shizuoka-shi , Saitama-ken . A variant of 熊谷 . Saitama-ken Kasukabe-shi In Ashihashi told that it was described as "Kumagai" in the Edo period. 熊谷 Kumagai reference.