Etymology and distribution of 忠島.

Tadashima 【忠島】^{レベル3
About 70}  The Japanese surnames etymology dictionary.

Aichi-ken , Hyougo-ken , Oosaka-fu . Distribution including Hayama. Tomoya is rare. Korean type . Originated in the county of Haman (South Korea) Gyeongsangnam Province (formerly Pasan). There is a record of naturalization on Kanagawa-ken Zushi-shi on November 7, 1955. The real name is Li. Lee is the mainstream for the real name. There is also Zhao else. 李 Ri reference. 趙 Chou reference.

Chuujima 【忠島】^{レベル3
About 70}  The Japanese surnames etymology dictionary.

Tokushima-ken , Saga-ken , Toukyou-to . Distribution that also includes Amadella. Niji is rare.

① Tokushima-ken Myouzai-gun Ishii-chou Origin of Ishii Nunnery. A place name with a record since the Edo period.

② Saga-ken Saga-shi Birthplace of Oiwa Town Daiji Nuni (Niji). A place name with a record since the Kamakura period.