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Family name Cyriacus (Cyriaque , Cyriacus , Кириак ) , throughout the world, is quite a common last name. The family name Cyriacus is characteristic of Sub-Saharan Africa, particularly Benin, where it is quite a rare surname, Burundi, and Rwanda. Measured by absolute frequency, it is the most numerous in Sub-Saharan Africa, particularly Nigeria, Ethiopia, and Benin. More prevalently, Cyriacus is the forename as well as the last name.