Etymology and distribution of 先成.

Sen'nari 【先成】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Kagoshima-ken Ooshima-gun Kikai-chou . Terrain . "Island" is added to Tohru which is the surname of Amagi archipelago of Kagoshima-ken . Estimated at the time of returning to Japan in 1953. 徹 Tetsu reference.