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Across the world, Judai (Judai ) is quite a rare epicene given name. The forename Judai is habitual in Japan, where it is quite a rare mostly girly, but seldom masculine name, the Democratic Republic of the Congo, where it is a rare unisex name, and Tanzania, where it is a very rare boy's name. Measured by absolute frequency, the name is most common in Japan, the Democratic Republic of the Congo, and India. Very seldom, Judai is the last name as well as the forename.
Judai is also a name for the fictitious and mythical characters: Judai Yuki , the fictional character from Yu-Gi-Oh! GX, Yu-Gi-Oh!: Bonds Beyond Time.