Surname Khải (Khải 
) , globally, is quite a rare last name. The surname Khải is characteristic of South-eastern Asia, particularly Vietnam, where it is quite a rare surname. Also, Khải is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Khải | Myanmar, United States, Vietnam |
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trịnh khải Vietnamese lord (b. 1763) |
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| đặng văn khải Nguyễn Dynasty period envoy to the Manchu-led Qing Dynasty. (b. 1794) |
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| phạm quang khải Vietnamese politician, VN (b. 1954) |
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| hoàng khải VN (b. 1964) |
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| phạm công khải Vietnamese amateur wrestler, VN |
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| phạm địch khải |
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