Kashiwai 【柏井】5 The Japanese surnames etymology dictionary.
① Topography . Kagoshima-ken Minamikyuushuu-shi Igako- machi Makinouchi From above Akasaki. Akasaki is a place name unknown in the record era. There was Akasaki Gate on the same place in the Edo period as a gate division system.
② Topography . From the gate gate on the gate division system that was in the Edo period. An example of the location of the gate. Kagoshima-ken Satsumasendai-shi Miyazaki cho. Kagoshima-ken Minamisatsuma-shi It is the upper red gate in Ikebara, Kinpincho . The name of the gate is from the red place above. Kagoshima-ken Satsumasendai-shi There is a Red Terrace in MIYAZAKI- machi surrogate .