Family name Hải (Hải 
, ハイ , Хай 
) , globally, is a common cognomen. The cognomen Hải is habitual in Vietnam, where it is quite a common surname, Macao, where it is quite a rare surname, and Ukraine, where it is a rare surname. In absolute terms, the name is most common in Vietnam, Ukraine, and Japan. Likewise, Hải is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hải | Japan, Macao, Taiwan, Vietnam, South Korea |
| ハイ | Japan |
| Хай | Ukraine, Belarus, Russia, Kazakhstan, Armenia |
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hoàng trung hải Deputy Prime Minister of Vietnam, VN (b. 1959) |
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| thanh hải Vietnamese poet, VN (b. 1930) |
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| đinh phúc hải VN (b. 1925) |
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| tôn thất hải Vietnamese fencer, VN (b. 1935) |
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| huỳnh văn hải Vietnamese swimmer, VN (b. 1940) |
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| quang hải VN (b. 1935) |
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| hoàng quốc hải VN (b. 1938) |
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| robert hải VN (b. 1940) |
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| phạm thị hải Vietnamese politician, VN (b. 1959) |
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| phạm phú hải VN (b. 1950) |
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| đinh trịnh hải VN (b. 1956) |
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| bùi văn hải (b. 1960) |
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| dương ngọc hải VN (b. 1968) |
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| lữ thanh hải VN (b. 1968) |
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| dương ngọc hải Vietnamese amateur wrestler, VN |
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