Etymology and distribution of 色島.

Iroshima 【色島】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Niigata-ken Jouetsu-shi , Toukyou-to , Kanagawa-ken . There is 宇賀 surname. Niigata-ken Jouetsu-shi Uraga- kuhara ward Kobamo Fuda (Kogamoda) was a place name with a record since the Edo period. It was in the Edo period in the same place. 宇賀 Uga reference.