Kawai 【川居】3 The Japanese surnames etymology dictionary.
① Saitama-ken Hanyuu-shi Originated from Uemura Kim, Shimomura-kun. The name of place called "Village Kimono" in the Muromachi Period. In the Edo era, the place name was called "Uemura Village · Shimomura Village." Saitama-ken Kasukabe-shi It was in the Edo era at Nishiginooki. Saitama-ken Kasukabe-shi tells that it was written as "Kimi-mura" in the Edo era. It is unknown whether Kimi village exists.