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Family name Justus (Justus , Юстус , יוסטוס ) , in the world, is a common surname. The cognomen Justus is characteristic of Sub-Saharan Africa, particularly Namibia, where it is quite a common surname, Kenya, where it is quite a rare surname, and Uganda. Not in comparison with a country's population, the name is most common in the United States, Nigeria, and Kenya. Also, Justus is the forename as well as the last name.