Ookura 【大倉】6 The Japanese surnames etymology dictionary.
Originated from Miyazaki-ken (formerly Hyuga). Akita-ken Yokote-shi Mt. Akita-ken Yokote-shi Otto Tanno In the east, let Miyazaki-ken (formerly Hyuga) go out. Akita-ken Ogachi-gun Ugo-machi In Horiuchi there is a belief that Mr. Horiuchi from Miyazaki-ken Nobeoka-shi named places and named the Otsuka family name. Horiuchi was a place name with a record since the Sengoku period. 堀内 reference.
② Nagano-ken Higashichikuma-gun Ikusaka-mura Origin of Higashi Hiroshi Asahi . In the Muromachi Period, a place name with a record in the notation "Dainichiyo". It was in the Muromachi period in the same place.