Etymology and distribution of 鱒.

Masu 【鱒】^{レベル3
About 100}  The Japanese surnames etymology dictionary.

Tokushima-ken , Nagasaki-ken , Kagoshima-ken .

① Topography . From rice and village. Tokushima-ken Itano-gun Kitajima-chou Distributed in Nakamura Ueda.

② Topography . "Ri" was added to rice, which is the surname of Amagi archipelago of Kagoshima-ken . Estimated at the time of returning to Japan in 1953. 米 Yone reference.