Etymology and distribution of 平時.

Hiratoki 【平時】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Okinawa-ken Naha-shi , Kagoshima-ken Ooshima-gun Setouchi-chou . Terrain . Added "river" to Taishi which is the surname of Amagi archipelago of Kagoshima-ken . Estimated at the time of returning to Japan in 1953. 泰 Tai reference.