Etymology and distribution of 大乙.

Oootsu 【大乙】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Aichi-ken .

① Aichi-ken Nagoya-shi Birthplace of Nishi-Bijikima Town (formerly Shimodayai) in Kamiochidai, Mid-Ochidai and Kiyosu City, Nishi-ku. In the Warring States Period, the name of the place with a record in the notation of "Otai". There is a record of the name of "Odae" in the Muromachi period near the same place.

② Nagano-ken Saku-shi Origin of Odakai. A place name with a record since the Kamakura period. Good neighbor . Toukyou-to Higashimurayama-shi Distributed in Kumekawa-cho.