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Around the world, Placidus (Placid , Plácido , Placidus ) is quite a rare boy's forename. The first name Placidus is characteristic of Uruguay, where it is a rare boy's name, Bolivia, and Czechia. Not in comparison with a country's population, it most frequently occurs in Nigeria, Tanzania, and Bangladesh. Likewise, Placidus is the last name as well as the forename.