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Family name Mạnh (Manh , Mạnh , マイン ) , globally, is a common surname. The surname Mạnh is habitual in Vietnam, where it is quite a common surname, Laos, where it is quite a rare surname, and Macao. In absolute terms, this name is the most popular in South-eastern Asia, particularly Vietnam, Malaysia, and Laos. Also, Mạnh is the forename as well as the last name.