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Around the globe, 健一 (Jianyi , 健一 , Ken-Ichi ) is quite a rare largely boy's, but uncommonly feminine first name. The forename 健一 is characteristic of Taiwan, where it is a rare boy's name, Afghanistan, and Singapore, where it is a rare gender-neutral name. In absolute terms, it most frequently occurs in China, Taiwan, and Afghanistan. Very seldom, 健一 is the last name as well as the forename.
健一 is also a name for the fictitious and mythical characters: .