Globally, Khải (Khải 
) is quite a rare primarily male, but scarcely female forename. The given name Khải is characteristic of South-eastern Asia, particularly Vietnam, where it is quite a rare primarily boy's, but very infrequently female name. Also, Khải is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Khải | Vietnam, United States, Myanmar |
| la khải King of Champa (b. 1350) |
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vũ phạm khải (b. 1807) |
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khải định Vietnamese emperor, VN (b. 1885) |
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| trần tuấn khải VN (b. 1895) |
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| nguyễn khải Vietnamese writer, VN (b. 1930) |
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nguyễn thiện khải VN (b. 1985) |
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| lê quang khải Vietnamese athletics competitor, VN (b. 1952) |
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| khải hưng VN (b. 1948) |
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| đỗ khải Vietnamese footballer, VN (b. 1974) |
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