Etymology and distribution of 當真.

Touma 【當真】^{レベル4
About 700}  The Japanese surnames etymology dictionary.

Kagoshima-ken , Fukuoka-ken , Kumamoto-ken .

① Topography . From Hara and the favorite "Ei". Kagoshima-ken Ibusuki-shi Nishigata Eikichi is an unknown place name in the era of recordation. It is distributed in the same place. Ooita-ken Nakatsu-shi Kamiyanaga (formerly Miyanaga) was a place name with a record since the Muromachi Period. It is distributed in the same place.

② Creation . "Yong" was added to Hara which is the surname of Amagi archipelago of Kagoshima-ken . Estimated at the time of returning to Japan in 1953. 原 Hara reference.