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In all the world, Aizen (Aizen , Айзен ) is a rare mostly masculine, but seldom girly given name. The given name Aizen is habitual in Saudi Arabia, where it is a rare masculine name, Algeria, and Philippines, where it is a very rare gender-neutral name. Not in comparison with a country's population, this name is the most popular in Indonesia, Philippines, and Saudi Arabia. Likewise, Aizen is the last name as well as the forename.
Aizen is also a name for the fictitious and mythical characters: .