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Across the world, Mitsui (ミツイ , Mitsui , 三井 ) is quite a common boy's forename. The given name Mitsui is characteristic of Eastern Asia, particularly Japan, where it is quite a rare boy's name, and China, where it is a very rare predominantly masculine, but scarcely female name. Much less frequently, Mitsui is the last name as well as the forename.
Mitsui is also a name for the fictitious and mythical characters: .
Yu, Okada, Yusei, Makino, Sakuma, Suzuki, Campos, Kazama, Tanaka, Yamada, Morales, Atsushi, Kikuchi, Duzanowski, España, Hisashi, Sumitomo, Takemasa, Nakayama, Nakajima, Watanabe, Kobayashi, Honda, Taniguchi, Tevis, Brito, Xd, Abe, Koi, Ryo, Jun, Ito, Ono, Zhu, Sato, Aoki, Kato, Kazu, Rina, Dave, Odai, Wada, Yoko, Saito, Shota, Akama, Ayumi, Kanno, and Takahashi