Etymology and distribution of 龍堀.

Tatsubori 【龍堀】^{レベル3
About 60}  The Japanese surnames etymology dictionary.

Aomori-ken · Chiba-ken . Thing . From feathers. In Aomori - ken , I tell him that he changed his name at the Meiji New Family Name at the time of the Edo period from the idea that he could not fly with one wing with Toba surname. 鳥羽 Toba reference.