Surname Katzenjammer (Kac 
, Katzenjammer) , in the world, is quite a common last name. The cognomen Katzenjammer is characteristic of Slovenia, where it is quite a common surname, Morocco, and Malaysia, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Morocco, Slovenia, and Algeria. Much less frequently, Katzenjammer is the forename as well as the last name.