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Last name Diaconus (Deacon , Diakon , Diaca ) , around the globe, is a common cognomen. The surname Diaconus is characteristic of Isle of Man, where it is quite a common surname, Jamaica, and the United Kingdom, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in the United Kingdom, the United States, and Australia. Much less frequently, Diaconus is the forename as well as the last name.