Across the world, Касія (Kassia 
, Касія 
) is a common feminine first name. The given name Касія is habitual in Brazil, where it is quite a rare female name, Angola, and Portugal, where it is a rare female name. Not in comparison with a country's population, it is commonest in Brazil, Angola, and the United States. Very seldom, Касія is the last name as well as the forename.