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Around the world, 空 (空 , Kudo ) is quite a rare gender-neutral first name. The first name 空 is characteristic of Vietnam, where it is a rare mostly boy's, but infrequently girly name, China, and Indonesia, where it is a rare unisex name. Not in comparison with a country's population, this name is the most popular in China, India, and Indonesia. More prevalently, 空 is the last name as well as the forename.
空 is also a name for the fictitious and mythical characters: .