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In the entire world, Izu (Izu , Zoo , 伊豆 ) is quite a common gender-neutral forename. The given name Izu is characteristic of Fiji, where it is quite a rare male name, Nigeria, where it is quite a rare gender-neutral name, and Algeria, where it is quite a rare mostly boy's, but seldom girly name. In absolute terms, it is commonest in Nigeria, Egypt, and Algeria. Likewise, Izu is the last name as well as the forename.
Izu is also a name for the fictitious and mythical characters: Izu , the fictional character of Kamen Rider Zero-One.