Family name كاسيا (Kasia 
, Kaisa 
, Casilla 
) , worldwide, is a common last name. The family name كاسيا is habitual in the Dominican Republic, where it is quite a common surname, Bolivia, where it is quite a rare surname, and Poland. Measured by absolute frequency, the name is most common in the Dominican Republic, Philippines, and Poland. More frequently, كاسيا is the forename as well as the last name.