Etymology and distribution of 検学.

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

Niigata-ken , Fukuoka-ken , Hokkaidou .

① variant of 酒井 . In Iwate - ken Oushuu - shi 's Mizusawa, say that the official corrected Sakai surname at Meiji New surname.

② Origin of Fukui-ken Sakai-shi . A place name with a record since the Nara period. Nagano-ken Komagane-shi Nakazawa has a tradition. Good neighbor . Gunma-ken Takasaki-shi Distribution in Misono-cho Kashiwisawa.

③ Fukuoka-ken Ookawa-shi Birth from Sakai. The place name with a record in the notation of "Sakai" in the North-South morning era. It is distributed in the same place.

④ Niigata-ken Niigata-shi Birth of Sakai and Sakai -e, Nishi-ku. A place name with a record since the Edo period. The place name was also written as "border". It is distributed in the same place.