Etymology and distribution of 空増.

Soramasu 【空増】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Fukuoka-ken , Aichi-ken , Saitama-ken . A variant of 豊島 . Saitama-ken Gyouda-shi Honmaru was a keystone of Narita who was a castle owner in the Sengoku period · Azuchi Momoyama period. 豊島 Toyoshima reference.

※ Saitama-ken Kumagaya-shi Toshima is a place name with a record since the Edo period. The place name was also called "Toshima", "Tajima".

※ Korean type . Terrain . "Island" is added to "hand" including Ding. There is a record of naturalization on Osaka-fu Neyagawa-shi on June 12, 1970. There is also "Ding-jima". It is unknown whether Dingjima exists. 丁 Chou reference.