Koseki 【古関】5 The Japanese surnames etymology dictionary.
Okayama-ken . Okayama-ken Katsuta-gun Shouou-chou In Toyoshi- da, tell Kanagawa-ken Kamakura-shi the descendant of Mr. Sakura who came to 1201 (the first year Jiannen) or 1205 (Motohisa 2 years). It is based in the same place. Okayama-ken Katsuta-gun Shouou-chou In the Kamakura period was the notation of " Sakuwa" in the neighborhood of Oshima (formerly Koyoshino ). It is unknown whether Kazaki Saku exists.