Etymology and distribution of 辰井.

Tatsui 【辰井】^{レベル4
About 600}  The Japanese surnames etymology dictionary.

Kagoshima-ken Satsumasendai-shi . Kagoshima-ken Satsumasendai-shi Originated from Inami-machi Urayanagi (formerly Nakagi Yard (Nakagoba)). Place name recorded in the Nanboku era era. Last name is also written as "Nakagi garden". It is unknown whether Nakagi garden exists. In the same place there was a middle fielder gate in the Edo era of the system of division.