Etymology and distribution of ビイソム.

Biisomu* 【ビイソム】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Yamaguchi-ken Iwakuni-shi , Toyama-ken Uodzu-shi .

① Convention . Abbreviation of Muroto Muroho's "Room" is used. Yamaguchi-ken Tradition at Iwakuni-shi . Estimated in the Edo era change. 室茂 Muroshige reference.

② There is a surname including "room".