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In the entire world, Zài (在 , Zài ) is quite a rare mostly masculine, but seldom girly forename. The forename Zài is characteristic of China, where it is a rare largely masculine, but uncommonly girly name, and Tunisia, where it is a rare female name. More frequently, Zài is the last name as well as the forename.
Zài is also a name for the fictitious and mythical characters: Jae , the fictional character from Star Trek: The Next Generation.