Kasai 【笠井】6 The Japanese surnames etymology dictionary.
① Originated from Ishikawa-ken southern part (formerly Kaga). A place name with a record since the Nara period. Meaning "Mr. Fujiwara of Kaga". Gifu-ken Gifu-shi Kurono is the lord of the Clan in the Clan Office, Ehime-ken Matsuyama-shi Marunouchi is the lord of Iyo Matsuyama of the Clan Agency, Kumamoto-ken Kumamoto-shi Chuo-ku Honmaru to the Kumamoto Domain of the Clan Agency Azuchi Momoyama period · Edo Era, Yamagata-ken Tsuruoka-shi Maruoka is the lord of Daimei Maruoka, the lord of Daimei Maruoka, Fukushima-ken Aidzuwakamatsu-shi Ochiai town is the Aizu lord of the clan office, Fukushima-ken Tamura-gun Miharu-machi Omachi is the clan lord of the clan, Fukushima -ken Nihonmatsu-shi Guo Yuan is the lord of Nihonmatsu of the Clan Agency, Tochigi-ken Shimotsuga-gun Mibu-machi Honmaru is the Mibu lordship of the Clan office, Shiga-ken Kouka-shi Mizuguchi Town Honmaru is the lords of the Mizuguchi of the Clan Agency, Tottori-ken Yonago-shi Kume city is the Yonago lord of the clan office, Shimane-ken Ooda-shi Kawai cho Koshiyonaga is the lord of Yoshinaga of the clan office, Ehime-ken Oozu-shi Ozu is the lord of Ozu of the clan office, Ehime-ken Oozu-shi Shinya cho Was in the Edo era as the lord of Shintani of the Clan office. Chiba-ken Ichikawa-shi Kato Nitta is a stopover. A place name with a record since the Edo period. Tell the place name that Mr. Kato developed in the Edo period. Good neighbor . Aichi-ken Ama-shi Nishijuku, Nagano-ken Nagano-shi Distributed in Matsushiro cho Nijo.