Etymology and distribution of 洞木.

Utsurogi 【洞木】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Fukuoka-ken , Saga-ken , Nagasaki-ken .

① Fukuoka-ken Kurume-shi Shijima Town birth from Esashima. A place name with a record since the Kamakura period.

② Ooita-ken Usa-shi Originated from Esashima, a small figure in Esuka . The name of a place with a record in the notation of "Esashima" during the Heian period.

③ Topography . From Jiang and island like land. Tottori - ken Yazu - gun Wakasa - chou In Itami - mimi tells that it changed from Ito 's surname. Estimated from tradition in the early Edo period. 伊東 Itou reference.