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Worldwide, Callistus (Callistus , Каллист ) is quite a rare principally masculine, but very seldom girly forename. The forename Callistus is characteristic of Sub-Saharan Africa, particularly Nigeria, where it is quite a rare primarily boy's, but scarcely feminine name, Ghana, where it is a rare male name, and Cameroon. In absolute terms, it is the most numerous in Sub-Saharan Africa, particularly Nigeria, Ghana, and Kenya. Also, Callistus is the last name as well as the forename.
Callistus is also a name for the fictitious and mythical characters: Callistus , the operatic character in the opera Der verführte Claudius.