Surname Cephalus (Cefal 
, Cefalo 
, Cephalus 
) , throughout the world, is quite a rare family name. The cognomen Cephalus is characteristic of Italy, where it is quite a rare surname, the United States, where it is a rare surname, and Venezuela, where it is a very rare surname. In absolute terms, it is commonest in Italy, the United States, and Brazil. Much less frequently, Cephalus is the forename as well as the last name.