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Last name Didymus (Didymus , Дидим ) , around the world, is a rare cognomen. The family name Didymus is habitual in Cameroon, where it is a rare surname, Malaysia, where it is a very rare surname, and the United Kingdom. Measured by absolute frequency, it is commonest in Cameroon, Nigeria, and the United Kingdom. Also, Didymus is the forename as well as the last name.