Cognomen Vanthi (Vanthi 
) , in the world, is a very rare last name. The last name Vanthi is characteristic of Vietnam, where it is a very rare surname, India, where it is an extremely rare surname, and Thailand. Not in comparison with a country's population, this name is the most popular in India, Vietnam, and the United States. Also, Vanthi is the forename as well as the last name.