Sakaiya 【境屋】3 The Japanese surnames etymology dictionary.
Saitama-ken , Toukyou-to , Toyama-ken . Terrain . From island like land and swans. Saitama-ken Gyouda-shi It was in the Inuzuka during the Edo period. In Ooita-ken Nakatsu-shi say that it was renamed from Shimada surname at Meiji New surname. 島田 reference. Toukyou-to Miyake-mura It is distributed in Izu.