Mitsui 【三居】3 The Japanese surnames etymology dictionary.
① There is an example of using a "valley" at a store of a shop name.
② Mie-ken Matsusaka-shi Wakaya (Waya) birthplace of the town. Place name with a record since the North / South morning era. Mie-ken Ise-shi In Nakajima it is said that it was written as 'Wakaya' during the North and South morning era. It is unknown whether Wadashi will exist.