Cognomen Vacuus (Vak 
, Vago 
, Gwag 
) , around the globe, is a common family name. The cognomen Vacuus is characteristic of Hungary, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Italy. In absolute terms, the name is most common in Hungary, Italy, and India. Very seldom, Vacuus is the forename as well as the last name.