Etymology and distribution of 下定.

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

Okayama-ken Asakuchi-shi , Okayama-ken Kurashiki-shi . Okayama-ken Asakuchi-shi Kojima cho is based. Ehime-ken was in the Warring States Period.

※ Ishikawa-ken Kanazawa-shi Marunouchi was in the Edo period in the Kaga clan in the Clan office. The same clan says Shiga - ken 's appearance as a descendant of Mr. Mabuchi. 馬淵 Mabuchi reference.