Cognomen Vanhai (Vanhai 
, Ванхаи 
) , around the globe, is a very rare family name. The surname Vanhai is habitual in Malaysia, where it is a very rare surname, Vietnam, and the United States, where it is an extremely rare surname. In absolute terms, it is the most numerous in Vietnam, Malaysia, and India. Likewise, Vanhai is the forename as well as the last name.