Quick answer
Kei is a boy/girl name.
Meaning and history
From Japanese 慧 ( kei ) meaning "intelligent", 圭 ( kei ) meaning "gemstone" or 慶 ( kei ) meaning "celebration". This name can also be formed from other kanji or kanji combinations.
Notes and context
Usage: japanese | Japanese Hiragana: けい; Japanese Katakana: ケイ