Cognomen Вичай (Vichai 
, Vichay 
, Вичай 
) , worldwide, is a rare last name. The family name Вичай is habitual in Thailand, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Hungary. In absolute terms, it is commonest in Thailand, China, and Myanmar. More frequently, Вичай is the forename as well as the last name.