Etymology and distribution of 河笠.

Kawakasa 【河笠】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Nagasaki-ken , Miyazaki-ken Nichinan-shi · Oosaka-fu . Thing . From 'wealth' of grass and favorites. In Kagoshima-ken tells that descendants of Mr. Tsuruya called for the Kamakura period. 都留 Tsuru reference.