Family name Вадя (Vadya 
, Vadia 
, Vadja 
) , across the world, is quite a rare last name. The surname Вадя is habitual in Romania, where it is a rare surname, Singapore, and South Africa. Not in comparison with a country's population, it is commonest in India, Indonesia, and South Africa. Likewise, Вадя is the forename as well as the last name.