Cognomen Frac (Frak 
, Frac 
, Frock 
) , in the world, is quite a rare last name. The cognomen Frac is habitual in Poland, where it is quite a rare surname, Philippines, where it is a rare surname, and Slovakia. In absolute terms, it is commonest in the United States, Poland, and Philippines. Also, Frac is the forename as well as the last name.