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In all the world, 三井 (Mitsui , 三井 , Мии ) is quite a common boy's first name. The forename 三井 is characteristic of Eastern Asia, particularly Japan, where it is quite a rare masculine name, and China, where it is a very rare largely male, but uncommonly female name. Much less frequently, 三井 is the last name as well as the forename.
三井 is also a name for the fictitious and mythical characters: .