Cognomen Vadio (Badiu 
, Vagari 
, Vadio 
) , in the world, is quite a common surname. The surname Vadio is habitual in Romania, where it is quite a common surname, Moldova, where it is quite a rare surname, and Afghanistan, where it is a rare surname. In absolute terms, this name is the most popular in Romania, India, and Afghanistan. Very seldom, Vadio is the forename as well as the last name.