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Last name Protasius (Protasius , Protásio ) , in the entire world, is a rare surname. The surname Protasius is characteristic of Namibia, where it is quite a rare surname, Portugal, where it is a rare surname, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Namibia, Portugal, and Tanzania. Likewise, Protasius is the forename as well as the last name.