Family name וילאני (Villani 
, וילאני 
) , throughout the world, is a common surname. The cognomen וילאני is habitual in Italy, where it is quite a common surname, Paraguay, where it is quite a rare surname, and Argentina. Measured by absolute frequency, the name is most common in Italy, the United States, and Brazil. Very seldom, וילאני is the forename as well as the last name.