Etymology and distribution of 熊賀.

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

Mie-ken Ise-shi . Heterogeneity of 川口 . Mie - ken Ise - shi In Asakuma Town tells that it changed from Kawaguchi 's surname. Estimated in the Edo period. 川口 Kawaguchi reference.