Cognomen Ванхаи (Vanxai 
, Vanhai 
, Ванхаи 
) , across the world, is a very rare last name. The last name Ванхаи is characteristic of Malaysia, where it is a very rare surname, Vietnam, and the United States, where it is an extremely rare surname. More frequently, Ванхаи is the forename as well as the last name.