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Surname Sixtus (Sixtus , Сикст ) , throughout the world, is quite a rare cognomen. The cognomen Sixtus is habitual in Cameroon, where it is quite a rare surname, New Zealand, and Ghana. Measured by absolute frequency, it is commonest in Sub-Saharan Africa, particularly Nigeria, Tanzania, and Ghana. Also, Sixtus is the forename as well as the last name.