You can’t really shorten Kai. Sorry if you can’t be bothered to say a whole three-letter name.
Famous people named Kai:
Actors Kai Lennox, Kai Owen, Kai Alexander, Kai Chapman, and Kai Caster; jazz musician Kai Winding; radio journalist Kai Ryssdal.
Kai means a lot of different things in a lot of different languages: in Japanese, “ocean,” “shell,” “restoration,” and “recovery”; in Chinese, “triumph,” and “open”; in Basque, “pier of a harbor”; in Swedish, “rejoice”; and in Thai, “chicken.”
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