Etymology and distribution of 定中.

Sadanaka 【定中】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Ibaraki-ken , Fukushima-ken .

① Ibaraki-ken Hitachi-shi birthplace of Shimokawa-cho. A place name with a record since the Nara period. The place name was also written as "Yone River".

② Yamagata-ken Higashitagawa-gun Mikawa-machi Birth of Suikawa. A place name with a record in the notation of "Yukawa" during the Warring States Period.