Hoai is a given name (Vietnamese have their surname first, followed by their given name). Notable people with this given name include:
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Phạm Thị Hoài (born 1960), Vietnamese writer, editor and translator
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Trần Văn Hoài (1929–2010), Vietnamese Roman Catholic prelate and activist
See also
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HOAIC (not to be confused with Hoai)
{{given name, Hoai