Surname Placidus (Placid 
, Plácido 
, Placidus 
) , around the world, is quite a rare family name. The last name Placidus is characteristic of Portugal, where it is quite a rare surname, Angola, where it is a rare surname, and Uruguay. In absolute terms, this name is the most popular in Portugal, Tanzania, and Nigeria. Likewise, Placidus is the forename as well as the last name.
| iulius placidus Roman military tribune (b. 100) |
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| marcus maecius memmius furius baburius caecilianus placidus Roman politician (b. 300) |
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| lactantius placidus ancient Roman writer (b. 300) |
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| rufius achilius maecius placidus politician (b. 450) |
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| gaius memmius caecilialus placidus suffect consul some time in the 3rd century |
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| caecilius placidus |
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