Cognomen קאפ (Cup 
, Kapp , קאפ 
) , across the world, is a common family name. The cognomen קאפ is characteristic of Estonia, where it is quite a common surname, Kosovo, and Germany, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Germany, the United States, and South Africa. Very seldom, קאפ is the forename as well as the last name.