Sounai 【惣内】3 The Japanese surnames etymology dictionary.
① Kyouto-fu Originated from the vicinity of a thousand (senbon) trucks of Kyouto-shi . A place name with a record since the Edo period. There is a story that there are thousands of standing pagodas in the Heian period during the Heian period. Tochigi-ken Haga-gun Motegi-machi Machida It is a tradition at Ishihon .
② Tochigi-ken Haga-gun Motegi-machi Origin of Senbon (senbon). A place name with a record since the Warring States Period. There is a passage that Mr. Nasu called in 1186 (Bunji 2 years) on the same place. 那須 reference. Tochigi - ken Haga - gun Motegi - Machi Machida At Ishi - za there is a tradition that the place name comes from the name of Mr. Chikamoto. Ooita - ken Ooita - shi Tochigi is told that Tochigi - ken Haga - gun Motegi - machi comes out of Senbon. Good neighbor . Gunma-ken An'naka-shi Distributed in furries.
④ Creation . Kagoshima-ken Aira-shi From Senbon-mon gate of the gate division system in Edo era in Miki-cho. There are one thousand of salt in the lower story. Last name is Senbon. Estimated gate name is also Senbon.