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Worldwide, كاسيا (Kasia , Kaisa , Casilla ) is a common principally girly, but very infrequently boy's first name. The forename كاسيا is characteristic of Poland, where it is a common feminine name, Finland, where it is quite a common female name, and Estonia, where it is quite a rare female name. Measured by absolute frequency, it is commonest in Poland, India, and the United States. Much less frequently, كاسيا is the last name as well as the forename.
كاسيا is also a name for the fictitious and mythical characters: Rajamäkis Kaisa , character in The Seven Brothers; Kaisa , the operatic character in the opera Juha by Leevi Madetoja; hired girl on Juha's farm; Kaisa , the operatic character in the opera Juha by Aarre Merikanto and Kaisa , the operatic character in the opera The Ostrobothnians by null; dependent tenant (i.e., extra maid) on the Harri farm.