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Across the world, Z. (Z. , زد , З. ) is quite a common mostly masculine, but seldom feminine first name. The first name Z. is habitual in Indonesia, where it is quite a rare mostly male, but seldom feminine name, Taiwan, where it is a rare boy's name, and Bulgaria, where it is a rare girly name. Measured by absolute frequency, it is commonest in Indonesia, China, and Bangladesh. Much less frequently, Z. is the last name as well as the forename.
Z. is also a name for the fictitious and mythical characters: Kristine Kochanski , the fictional character from Red Dwarf.