Cognomen Ченчи (Cenci 
, Ченчи 
) , around the world, is a common surname. The cognomen Ченчи is characteristic of San Marino, where it is a common surname, Italy, where it is quite a rare surname, and Brazil. Measured by absolute frequency, it is commonest in Italy, Brazil, and Argentina. Very seldom, Ченчи is the forename as well as the last name.