Family name Hoài (Hoai 
, Hoài 
) , in all the world, is a common surname. The surname Hoài is characteristic of Macao, where it is quite a common surname, Vietnam, and Malaysia, where it is quite a rare surname. Also, Hoài is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hoai | Japan, Macao, Vietnam, Malaysia, United States |
| Hoài | Macao, Australia, Vietnam, Germany, United States |
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hoài linh Vietnamese comedian, VN (b. 1969) |
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bùi thị minh hoài VN (b. 1965) |
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| philippe trần văn hoài Vietnamese Roman Catholic prelate, VN (b. 1929) |
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| phạm thị hoài contemporary Vietnamese writer, editor and translator, living in Germany, VN (b. 1960) |
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